No, the problem only appears in "opera Gx". Now I also understood that the problem not only affects different pages, the problem also affects the same browser by pressing "F11" without opened pages.

Hello, before asking a question, I will explain the context, using OperaGX on a website which offers different options to play a video, when opening the video in full screen the brightness level of the PC increases, I would like to know how I can prevent this from happening.