The Apple Watch Ultra has a brand-new button, called the "Action" button, that you can program to do a number of specific actions. Here's how.

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Make any necessary changes to the text and formatting of the previous and next buttons, and then select "Update Preview" to see your changes applied on screen.

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How to Map Functions to the Action Button Once your Apple Watch Ultra is set up, you can re-assign functions to the Action button via a new menu right on your wrist, like so.