https://wccftech.com/windows-11-brings-new-improvements-for-auto-hdr-through-xbox-game-bar-app/

The Auto HDR feature was one of the solutions that Microsoft implemented to correct its troubled history with HDR. This feature uses machine learning to evaluate the color palette of any game you are playing and then boosts those colors using an internal API-level filter to simulate a native implementation of HDR within the game's graphics settings even if the games didn't have HDR support.

Now, an update for Windows 11 allows for new improvements for this feature through the Xbox Game Bar. First, players are able to adjust the Auto HDR intensity through a slider. The Auto HDR intensity slider lets you control how vivid and bright the colors in games look. In games with extremely bright or dim colors, you can adjust the slider to your liking so you can get the best Auto HDR experience.