I always thought shake-to-undo was a reference to resetting an Etch A Sketch. It’s not discoverable, but it is in the user guide. If you find yourself acciden

I always thought shake-to-undo was a reference to resetting an Etch A Sketch. It’s not discoverable, but it is in the user guide. If you find yourself accidentally activating it, you can turn it off in accessibility settings. If you would rather have a button for it, you can turn on assistive touch.