There are settings that causes the screen to flicker when certain apps are running.
Developer Options:
Show Touches
- ON will give visual feedback for touch interactions.
- Default is OFF
Show screen Updates:
- Make areas of the screen flash when they update.
- Default is OFF
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Settings/Accessibility/Dexterity and interaction
- Interaction Control: Verify that it is OFF
Settings/Motions and Gestures
- Turn Air Browse OFF to see if that helps
Settings/Air View
- Turn OFF if ON to see if that helps