diff --git a/Controller.cs b/Controller.cs
index b506a1e..bd9b7e6 100644
--- a/Controller.cs
+++ b/Controller.cs
@@ -613,7 +613,12 @@ private void MouseDraw(MainWindow main, Point p)
             if (ellipsesQueue.Count > 30) //this is arbitrary
             {
                 Shape shapeToRemove = ellipsesQueue.Dequeue();
-                main.mouseDragCanvas.Children.Remove(shapeToRemove);
+
+                // Remove this shape from all connected monitors
+                foreach (MainWindow window in windows)
+                {
+                    window.mouseDragCanvas.Children.Remove(shapeToRemove);
+                }
             }
         }