How to prevent screen getting brighter and darker based on content displayed?

Hi. I have tried to use Intel® Graphics Command app, but it does not have Power tab. Also tried adding registery keys from here https://dancharblog.wordpress.com/2019/04/14/disable-intel-dpst-adaptive-contrast-brightness-on-new-uwd-dch-drivers/ but still no luck.

Is there a way to stop the this functionality or maybe there is something wrong with my device?

no power tab