Why an increase in brightness in the full screen mode?

In the settings Windows was tampered with. Found nothing that could rectify the situation. Watch the video on Youtube or a movie, everything is fine. When you enter into full-screen mode, acoste jumps to 100% and I can not resolve this problem. In the browser settings did some digging. I suppose all the matter in it (Opera GX). Since it started with how I downloaded it. But in the settings still nothing found. Maybe someone also had this problem and can help me. Thank you in advance.
April 19th 20 at 12:12
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