>>105617927
There's a separate SDR content brightness slider option that appears when you activate Windows HDR.
You need to lower that slider to a level that makes sense for you, but it's recommended to enable HDR only when you're consuming HDR content (Windows key + Alt + B hotkey).
Your monitor should leave the sRGB preset when you enable HDR and vice versa, update your monitor's firmware if the SDR/HDR profiles aren't automatically switching.

https://tftcentral.co.uk/articles/heres-why-you-should-only-enable-hdr-mode-on-your-pc-when-you-are-viewing-hdr-content
https://github.com/Maassoft/ColorControl/issues/326