Hello @Ralph324 let's look below and click on the Fitbit help link, a quick search will bring up this document.
How do I change the clock face on my Fitbit device?
To sum up. Tap your avatar in the top left, tap your Versa, tap clock faces, then All Clocks.
Choose a clock and tap Select. You will need to have your phone connected to the Internet through cell or WiFi and Bluetooth turned on.
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