diff --git a/src/components/Viewport.vue b/src/components/Viewport.vue
index fe079680b..d52ec0c1e 100644
--- a/src/components/Viewport.vue
+++ b/src/components/Viewport.vue
@@ -703,7 +703,7 @@ function onCanvasMouseDown(event: MouseEvent) {
 
       scaleDragState.isDragging = true
       scaleDragState.handleInfo = handleInfo
-      scaleDragState.isRightDrag = event.button === 2
+      scaleDragState.isRightDrag = event.button === 2 || event.button === 1
       scaleDragState.startMousePosition.copy(mouse)
 
       // Store starting scales and positions for all selected objects
@@ -760,7 +760,7 @@ function onCanvasMouseDown(event: MouseEvent) {
 
       rotateDragState.isDragging = true
       rotateDragState.axis = axis
-      rotateDragState.isRightDrag = event.button === 2
+      rotateDragState.isRightDrag = event.button === 2 || event.button === 1
 
       // Store starting rotations for all selected objects
       const selectedMeshes = sceneStore.selectedObjects.map((o) => o.mesh)
@@ -794,7 +794,7 @@ function onCanvasMouseDown(event: MouseEvent) {
 
       dragState.isDragging = true
       dragState.axis = axis
-      dragState.isRightDrag = event.button === 2
+      dragState.isRightDrag = event.button === 2 || event.button === 1
       dragState.startMousePosition.copy(mouse)
 
       // Store original positions and calculate center