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Hi @MernCena - there are several ways to change a clock face.
On the watch, a gentle long press in the middle of the display, or a swipe the display left till you find the Clocks app, or from the Gallery tile in the Fitbit App.
There you can also check if the Clocks app is installed and if not install it.
It's possible that the [perhaps rushed] new firmware (January 2025) has faults and if so thanks for reporting it.
Author | ch, passion for improvement.