My HDR is turned on why does it shut off when I fullscreen a game?

[Ariune]

Whenever I fullscreen a video game, my HDR seems to turn off. I can tell because the colors became more saturated and vibrant all of sudden and it hurts my eyes. I notice that the "HDR" small icon appears for a few seconds on the top right of my monitor when I minimize the game or exit fullscreen, and HDR is back on. It's like HDR is turning off when the game is fullscreen. Could you help me figure out why this is happening?

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