https://i.imgur.com/38C1ihU.jpeg

Drawing on the ipad mini is fun in sketchbook, but I don't understand why
apple won't allow you to assign undo to the action of double-tapping your finger on the apple pencil (instead of switching tools or switching to the eraser). This seems like a inexplicable lack of customization, as it's a
very obvious choice to have undo available right from the pencil with
a simple gesture.

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