diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index d3ee48a85..b51219dbc 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -1165,4 +1165,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/Cartesio/Configuration_adv.h b/Marlin/example_configurations/Cartesio/Configuration_adv.h
index f6f8c4020..c26dfb816 100644
--- a/Marlin/example_configurations/Cartesio/Configuration_adv.h
+++ b/Marlin/example_configurations/Cartesio/Configuration_adv.h
@@ -1158,4 +1158,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/Felix/Configuration_adv.h b/Marlin/example_configurations/Felix/Configuration_adv.h
index 4a334780f..176fd2ab2 100644
--- a/Marlin/example_configurations/Felix/Configuration_adv.h
+++ b/Marlin/example_configurations/Felix/Configuration_adv.h
@@ -1158,4 +1158,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/FolgerTech-i3-2020/Configuration_adv.h b/Marlin/example_configurations/FolgerTech-i3-2020/Configuration_adv.h
index 7867bddc7..b818e90f1 100644
--- a/Marlin/example_configurations/FolgerTech-i3-2020/Configuration_adv.h
+++ b/Marlin/example_configurations/FolgerTech-i3-2020/Configuration_adv.h
@@ -1165,4 +1165,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/Hephestos/Configuration_adv.h b/Marlin/example_configurations/Hephestos/Configuration_adv.h
index ab322752b..798d74177 100644
--- a/Marlin/example_configurations/Hephestos/Configuration_adv.h
+++ b/Marlin/example_configurations/Hephestos/Configuration_adv.h
@@ -1158,4 +1158,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/Hephestos_2/Configuration_adv.h b/Marlin/example_configurations/Hephestos_2/Configuration_adv.h
index b8ab84e48..a0c063576 100644
--- a/Marlin/example_configurations/Hephestos_2/Configuration_adv.h
+++ b/Marlin/example_configurations/Hephestos_2/Configuration_adv.h
@@ -1142,4 +1142,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/K8200/Configuration_adv.h b/Marlin/example_configurations/K8200/Configuration_adv.h
index 32c9114ca..7f5268d93 100644
--- a/Marlin/example_configurations/K8200/Configuration_adv.h
+++ b/Marlin/example_configurations/K8200/Configuration_adv.h
@@ -1171,4 +1171,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/K8400/Configuration_adv.h b/Marlin/example_configurations/K8400/Configuration_adv.h
index 7ffc9e04b..9ef3258f1 100644
--- a/Marlin/example_configurations/K8400/Configuration_adv.h
+++ b/Marlin/example_configurations/K8400/Configuration_adv.h
@@ -1158,4 +1158,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/RigidBot/Configuration_adv.h b/Marlin/example_configurations/RigidBot/Configuration_adv.h
index f259c0e42..3d6483b26 100644
--- a/Marlin/example_configurations/RigidBot/Configuration_adv.h
+++ b/Marlin/example_configurations/RigidBot/Configuration_adv.h
@@ -1158,4 +1158,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/SCARA/Configuration_adv.h b/Marlin/example_configurations/SCARA/Configuration_adv.h
index a7ad075e5..9f6d22b2d 100644
--- a/Marlin/example_configurations/SCARA/Configuration_adv.h
+++ b/Marlin/example_configurations/SCARA/Configuration_adv.h
@@ -1158,4 +1158,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/TAZ4/Configuration_adv.h b/Marlin/example_configurations/TAZ4/Configuration_adv.h
index 23e2226ff..8c510aab9 100644
--- a/Marlin/example_configurations/TAZ4/Configuration_adv.h
+++ b/Marlin/example_configurations/TAZ4/Configuration_adv.h
@@ -1158,4 +1158,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/TinyBoy2/Configuration_adv.h b/Marlin/example_configurations/TinyBoy2/Configuration_adv.h
index 94e357943..ee78175bc 100644
--- a/Marlin/example_configurations/TinyBoy2/Configuration_adv.h
+++ b/Marlin/example_configurations/TinyBoy2/Configuration_adv.h
@@ -1161,4 +1161,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/WITBOX/Configuration_adv.h b/Marlin/example_configurations/WITBOX/Configuration_adv.h
index ab322752b..798d74177 100644
--- a/Marlin/example_configurations/WITBOX/Configuration_adv.h
+++ b/Marlin/example_configurations/WITBOX/Configuration_adv.h
@@ -1158,4 +1158,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration_adv.h b/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration_adv.h
index 6fbc87f5f..010a1989d 100644
--- a/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/FLSUN/auto_calibrate/Configuration_adv.h
@@ -1163,4 +1163,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration_adv.h b/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration_adv.h
index ef7804587..b3f183a31 100644
--- a/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/FLSUN/kossel_mini/Configuration_adv.h
@@ -1162,4 +1162,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/delta/generic/Configuration_adv.h b/Marlin/example_configurations/delta/generic/Configuration_adv.h
index 057f30d71..deb74b6d6 100644
--- a/Marlin/example_configurations/delta/generic/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/generic/Configuration_adv.h
@@ -1160,4 +1160,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h b/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
index 057f30d71..deb74b6d6 100644
--- a/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
@@ -1160,4 +1160,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h b/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h
index 1b0cb7c48..8bb8f312a 100644
--- a/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h
@@ -1165,4 +1165,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h b/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h
index f705314f4..aad4304e5 100644
--- a/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h
@@ -1160,4 +1160,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/gCreate_gMax1.5+/Configuration_adv.h b/Marlin/example_configurations/gCreate_gMax1.5+/Configuration_adv.h
index cf186a11e..3f38210b5 100644
--- a/Marlin/example_configurations/gCreate_gMax1.5+/Configuration_adv.h
+++ b/Marlin/example_configurations/gCreate_gMax1.5+/Configuration_adv.h
@@ -1165,4 +1165,14 @@
  */
 #define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/makibox/Configuration_adv.h b/Marlin/example_configurations/makibox/Configuration_adv.h
index 9e1738a78..c8c38d60f 100644
--- a/Marlin/example_configurations/makibox/Configuration_adv.h
+++ b/Marlin/example_configurations/makibox/Configuration_adv.h
@@ -1158,4 +1158,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h b/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
index 76593f954..daf9e0d7d 100644
--- a/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
+++ b/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
@@ -1158,4 +1158,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/example_configurations/wt150/Configuration_adv.h b/Marlin/example_configurations/wt150/Configuration_adv.h
index cbad1319d..81d5028b2 100644
--- a/Marlin/example_configurations/wt150/Configuration_adv.h
+++ b/Marlin/example_configurations/wt150/Configuration_adv.h
@@ -1161,4 +1161,14 @@
  */
 //#define NO_WORKSPACE_OFFSETS
 
+/**
+ * This affects the way Marlin outputs blacks of spaces via serial connection by multiplying the number
+ * of spaces to be output by the ratio set below.  This allows for better alignment of output for commands
+ * like G29 O, which renders a mesh/grid.
+ *
+ * For clients that use a fixed-width font (like OctoPrint), leave this at 1.0; otherwise, adjust
+ * accordingly for your client and font.
+ */
+#define PROPORTIONAL_FONT_RATIO 1.0
+
 #endif // CONFIGURATION_ADV_H
diff --git a/Marlin/serial.cpp b/Marlin/serial.cpp
index 797c6107a..232a85c30 100644
--- a/Marlin/serial.cpp
+++ b/Marlin/serial.cpp
@@ -33,4 +33,4 @@ void serial_echopair_P(const char* s_P, float v)         { serialprintPGM(s_P);
 void serial_echopair_P(const char* s_P, double v)        { serialprintPGM(s_P); SERIAL_ECHO(v); }
 void serial_echopair_P(const char* s_P, unsigned long v) { serialprintPGM(s_P); SERIAL_ECHO(v); }
 
-void serial_spaces(uint8_t count) { while (count--) MYSERIAL.write(' '); }
+void serial_spaces(uint8_t count) { count *= (PROPORTIONAL_FONT_RATIO); while (count--) MYSERIAL.write(' '); }
diff --git a/Marlin/ubl.cpp b/Marlin/ubl.cpp
index 0f0c928e2..29e935a65 100644
--- a/Marlin/ubl.cpp
+++ b/Marlin/ubl.cpp
@@ -136,7 +136,7 @@
 
   void unified_bed_leveling::display_map(const int map_type) {
     const bool map0 = map_type == 0;
-    constexpr uint8_t spaces = 11 * (GRID_MAX_POINTS_X - 2);
+    constexpr uint8_t spaces = 9 * (GRID_MAX_POINTS_X - 2);
 
     if (map0) {
       SERIAL_PROTOCOLLNPGM("\nBed Topography Report:\n");
@@ -145,7 +145,7 @@
       serial_echo_xy(GRID_MAX_POINTS_X - 1, GRID_MAX_POINTS_Y - 1);
       SERIAL_EOL;
       serial_echo_xy(UBL_MESH_MIN_X, UBL_MESH_MAX_Y);
-      SERIAL_ECHO_SP(spaces - 3);
+      SERIAL_ECHO_SP(spaces);
       serial_echo_xy(UBL_MESH_MAX_X, UBL_MESH_MAX_Y);
       SERIAL_EOL;
     }
@@ -190,7 +190,7 @@
 
     if (map0) {
       serial_echo_xy(UBL_MESH_MIN_X, UBL_MESH_MIN_Y);
-      SERIAL_ECHO_SP(spaces + 1);
+      SERIAL_ECHO_SP(spaces + 4);
       serial_echo_xy(UBL_MESH_MAX_X, UBL_MESH_MIN_Y);
       SERIAL_EOL;
       serial_echo_xy(0, 0);