fix: x-ray pixel spacing calibration (#4922)

modes/segmentation/src/toolbarButtons.ts

@@ -394,12 +394,6 @@ const toolbarButtons: Button[] = [
         [ViewportGridService.EVENTS.VIEWPORTS_READY]: callbacks('MarkerLabelmap'),
       },
       options: [
-        {
-          name: 'Clear Markers',
-          type: 'button',
-          id: 'clear-markers',
-          commands: 'clearMarkersForMarkerLabelmap',
-        },
         {
           name: 'Marker Mode',
           type: 'radio',
@@ -422,6 +416,12 @@ const toolbarButtons: Button[] = [
             }
           },
         },
+        {
+          name: 'Clear Markers',
+          type: 'button',
+          id: 'clear-markers',
+          commands: 'clearMarkersForMarkerLabelmap',
+        },
       ],
     },
   },