PC gaming wiki has an entire list of games that support HDR right in this article
My personal favorites for HDR include
Assassin’s Creed Origins and Odyssey
Final Fantasy 7 remake
Star Wars Jedi Fallen Order, Squadrons, and Battlefront 2
Final Fantasy 15
Spider-Man 2018
Hogwarts Legacy
Lego Star Wars the Skywalker Saga
Monster Hunter World
Granted I’m not sure how many of these work in steamOS with HDR because apparently Forza Horizon doesn’t work. Forza Horizon 4 and 5 look stellar with HDR
PC gaming wiki has an entire list of games that support HDR right in this article
My personal favorites for HDR include
Assassin’s Creed Origins and Odyssey
Final Fantasy 7 remake
Star Wars Jedi Fallen Order, Squadrons, and Battlefront 2
Final Fantasy 15
Spider-Man 2018
Hogwarts Legacy
Lego Star Wars the Skywalker Saga
Monster Hunter World
Granted I’m not sure how many of these work in steamOS with HDR because apparently Forza Horizon doesn’t work. Forza Horizon 4 and 5 look stellar with HDR
Haven’t been able to get Odyssey to work with HDR on Deck yet.