The exit button is the red dot  in the top right corner of every screen of Expression. It is password protected but we kept it unlabeled to not draw any attention to it by guests. It is a small touch zone, and can take a few taps to activate.

To exit registry mode, tap the Exit button. A password screen will pop-up. Enter your Expression password, and tap “Exit” (A).

If you get the password correct you will be returned to the service selection screen.