Dark theme is available under Display and can usually follow a schedule. Individual apps may keep their own theme setting.
Steps
- Open Settings and tap Display
- Turn on Dark theme
- Open its schedule and choose sunset or custom hours
- Check frequently used apps for separate theme controls
Check the result
Test the change before moving on. Android menu names vary across Google
Pixel, Samsung Galaxy, Motorola, OnePlus and other phones, and a carrier or
work profile can also restrict a setting. Use Settings search when a label is
different and check the support page for the exact model before erasing data,
resetting connections or changing an account.
Privacy and safety
Read every confirmation screen, keep a current backup and grant only the
permissions the task requires. Stop if the phone becomes unusually hot, shows
physical battery damage or asks for a password or payment on an unexpected
site.
Official reference
Google Android Help is the
baseline reference; the phone maker and carrier may document additional steps.
More from Android Basics
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