To make Fitbit Charge 2 feel more in line with your style, you have the option to customize Clock Face.
Start by opening the Fitbit app and then select account in the tab bar and choose Fitbit Charge 2 in the list of available trackers.
To make sure the Clock Face chosen updates on your tracker, use the navbar in the top left corner to go back and then tap Sync Now. And that's all it takes to find the Clock Face that fits your look. Now it's time for some activity.
Once you've found it select Clock Face and tap the design you like best.