Hi there, @julietchurchill. Welcome to the Fitbit Community Forums. Thanks for bringing this to my attention. I will do my best to help you with this!
As a first approach, please go to your quick settings and check whether the screen wake is turned off. Press and hold the button, and swipe left to access the quick settings screen. Change whether the screen turns on when you turn your wrist. For more information, see How do I navigate my Fitbit device?
If this settings is set correctly, please try restarting your Charge 4 by following these steps How do I restart my Fitbit device?
If the above doesn't describe your issue and the restart doesn't work, please check if the sleep mode is enabled. When the sleep mode setting is on:
- Notifications don't cause the tracker to vibrate or the screen to turn on.
- The screen's brightness is set to dim.
- Turning your wrist won't cause the tracker’s screen to turn on.
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