Cannot drag widgets to the canvas

Issue

You can’t drag widgets to the canvas or add them using the Structure window. This can be accompanied by the widgets on the canvas glitching.

Solution

1. Click a widget on the canvas.
   
2. Click the plus sign on the upper toolbar.
   
3. Click a widget in the panel to add it to the canvas.
   
   You should now be able to drag widgets to the canvas.