April 5, 2023
1. In the Facebook app, tap the hamburger menu, the three horizontal lines in the bottom-right corner.
2. Scroll down and tap Settings & Privacy, then tap Settings in the drop-down menu.
3. On the Settings page, scroll down to the Preferences header and find and tap Dark Mode.
4. On the Dark Mode page, tap the circle next to On. You can also choose System, which matches the app’s appearance to your device’s dark or light system settings.