How to turn on “shake to undo” on iPhone / iPad

Note: For the iPhone model 14 pro max, or the latest iOS, “shake to undo” can be found under “Touch” in Accessibility.

• Open Settings
• Swipe down and tap General
• Tap Accessibility
• Swipe down and choose Shake to Undo
• Tap the toggle to turn on Shake to Undo

Here’s an illustration of the steps: