Oppo WATCH User Manual page 7

Under the screen off state, press Home button or Multifunction button to wake
the screen.
At the home screen, press Home button to go to the app list. Press Home button
to return to the home screen at any page.
Press Multifunction button to call up an app in shortcut (when you are not on
an app screen). Go to Settings > Personalization > Customize hardware
buttons > Bottom, right side to assign an app to this button.
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C2 General