Double tap to turn on the Samsung device's screen. The function is enabled by default and can also be disabled in the advanced functions. Double-tapping to turn on works for the lock screen, Always On Display or when neither is enabled.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Advanced features
Step 3:  Tap on  Motions and gestures
Step 4:  Enable or disable  Double tap to wake
  1. Open the Settings
  2. Tap on Advanced features
  3. Tap on Motions and gestures
  4. Enable or disable Double tap to wake

Samsung Instructions
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