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 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Display
Step 3:  Tap on  Blue light filter
Step 4:  Enable or disable  Turn on as scheduled
Step 5:  Choose between  Sunset to sunrise  and  Custom schedule
  1. Open the Settings
  2. Tap on Display
  3. Tap on Blue light filter
  4. Enable or disable Turn on as scheduled
  5. Choose between Sunset to sunrise and Custom schedule

Samsung Instructions
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