You can do what you wish and only override functions by starting as you already have - make a new widget, and reparent to your desired parent widget. You’ll see nothing there - but now delete the Canvas Panel object and recompile, and the parent widget will appear in its place. You can then work only in the Graph view and manipulate the parent as you like, but sadly as far as I can tell you are unable to add additional widgets to the Designer view. You could, however, use the Graph to create a widget and add it to an existing panel in the parent.
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