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The automatic brightness feature reduces eye strain and extends battery life, while a sensor scans the surroundings and always selects the best brightness.

Note: The automatic brightness can also be turned on or off in the quick settings.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Display & brightness
Step 3: Enable or disable  Auto brightness
  1. Tap on Settings
  2. Tap on Display & brightness
  3. Enable or disable Auto brightness
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Oppo Instructions