Brightness doesn't change on external display

I have a laptop with a external display and when i try to change brightness in windows it changes only on built in display. Night light works tho. I'd change brightness with monitor menu, but hdr on doesn't let me do this, and it still takes too much time. I wanna change brightness on both monitors with windows controll panel sliderLaptop: maibenben m543External display: DEXP DF24H1