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The blue light filter can be switched on or off manually or automatically on the Samsung device, either after sunrise/sunset or according to a self-defined schedule with start and end time.

Android 11 | One UI 3.0
Step 1: Tap on  Settings
Step 2: Tap on  Display
Step 3: Tap on  Eye comfort shield
Step 4: Tap on  Set schedule
Step 5: Choose  Sunset to sunrise  or  Custom
Step 6: Set the  Start/End time  and tap  Done
  1. Tap on Settings
  2. Tap on Display
  3. Tap on Eye comfort shield
  4. Tap on Set schedule
  5. Choose Sunset to sunrise or Custom
  6. Set the Start/End time and tap Done
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Samsung Instructions