Realme
Turn On/Off Dark Mode auf Realme
Dark mode replaces the bright white backgrounds in the system and in compatible apps with dark grey or black surfaces. On realme phones running Realme UI, this affects the home screen, the notification shade, the settings menu and any app that supports the system-wide theme.
The setting lives under display options, not inside a separate theme app, so it is easy to miss if you expect it somewhere else.
How to switch between Light and Dark
Open Tap on Settings ➔ Tap on Display & brightness ➔ Choose Light or Dark. Selecting Dark applies the theme immediately across the interface, and switching back to Light reverses it just as fast.
Some third-party apps manage their own theme independently and will not switch automatically, even when the system is set to Dark. In that case, check the appearance setting inside the app itself.
If your battery drains fast mainly outdoors in daylight, dark mode will not help much, since the effect depends on screen type and how often the display is at high brightness. On OLED panels, dark mode can meaningfully reduce power use because black pixels draw very little energy.