Android
Turn Dark Mode On or Off auf Android
Dark mode changes the background color of the system interface and supported apps from light to dark. It affects Settings, the notification shade, quick settings tiles, the keyboard and the app drawer.
Android controls this through a single toggle in Settings ➔ Display ➔ Dark theme. Tap it once to turn the theme on, tap it again to turn it off.
Some devices also offer a schedule option, letting the system switch automatically at sunset or at a fixed time. If Dark mode toggles itself without you touching the setting, check whether a schedule is active on the same screen.
Not every app follows the system-wide setting. Apps with their own dark theme switch usually need that option enabled separately inside the app, since developers can override the Android-wide preference.
If the background still looks bright after switching Dark theme on, force-closing the app or checking for an app update usually resolves the mismatch.