The FlipperForce Field mobile app has three appearance options: Light, Dark, and System.
Change Your Appearance
Tap your profile image in the upper right corner.
Tap Appearance at the top of the menu.
Select Light, Dark, or System.
What Each Option Does
Light: the classic FlipperForce look.
Dark: a dark theme that stays on all the time. Easier on the eyes at night or in low light.
System: automatically matches your phone's display setting. If your phone switches to dark mode at night, the app switches with it.
The mobile app defaults to System, so if your phone is already set to dark mode, the app will be too.
Your mobile app setting is separate from the web app. To change the appearance on the web app, see Does FlipperForce have a dark mode?