Screen lock during game

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Help, my samsung note 9 somehow now shows some kind of panel in the left side of screen during games. When I touch it or slide it to the right, it works as screen lock for accidental touch. When I long press, I can only move it along the left side of the screen. Anyone can guide me where I can disable this feature? Screenshot here https://pasteboard.co/gwrGP1WeGImr.jpg

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