Solved: S3422DWG, 2560x1080, Windows 10 HDR disabled
https://www.dell.com/community/Monitors/S3422DWG-2560x1080-Windows-10-HDR-disabled/m-p/8079164
Nov 20, 2021 . Regardless, it would seem Red Dead simply refuses to go full-screen this way making the in-game HDR option a non starter as it doesn't apply correctly. Such as I found out when I first unboxed this product as I generally play border-less window. Maybe one day GFX pricing will return to something reasonable, until then I can deal with it
DA: 43 PA: 48 MOZ Rank: 90