devblogs.microsoft[.]com/directx/exciting-additions-to-your-auto-hdr-experience-on-pc/
Available to all Windows 11 users today if you download latest Xbox Game Bar from the Microsoft Store.The Auto HDR intensity slider lets you control how vivid and bright you want the colors in your game to be with Auto HDR. 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. If you drag the slider all the way to the left, you have the minimum intensity, which is the equivalent of turning Auto HDR off, and if you drag the slider all the way to the right you have the full intensity of Auto HDR.
Note that this slider only applies to games with Auto HDR and not games with existing native HDR. The level of intensity is saved per game, meaning that you can set a certain level of intensity for AHDR for a particular game and it will not affect any Auto HDR settings in other games. The next time you play the same game, the Auto HDR slider will remember your previous setting.
In addition to the Windows Settings app, you can also now turn on or off Auto HDR by just accessing the Xbox Game Bar within your game. Navigate to the Xbox Game Bar, then click the Settings button. Within Settings, click on the Gaming features section. Within that section you will see a checkbox that says Use Auto HDR with supported games. Make sure it is checked if you want to use Auto HDR and unchecked if you do not want to use Auto HDR. For your changes to take place, you will need to relaunch the game.
Available to Windows InsidersIn the last year, we’ve added Auto HDR support for multi-discrete-GPU setups such as Nvidia’s Scalable Link Interface (SLI) and AMD’s CrossFire in DirectX12 games. In other words, if you have a set-up that takes advantage of multiple GPUs, you can now use Auto HDR in more games. This feature is currently available in the latest Windows Insider Program build in the Dev and Beta channels. [Emphasis Added]
Available to Windows InsidersFinally, we heard your feedback about excessive Auto HDR notifications. If you are finding the notifications for Auto HDR distracting to your game play, you can turn off these notifications in the settings. [Emphasis Added]