Here's the official Microsoft page of Xbox One X Enhanced titles:
https://www.xbox.com/en-US/games/xbox-one/xbox-one-x-enhanced-list
Their currently featured enhanced titles are:
https://www.xbox.com/en-US/games/xbox-one/xbox-one-x-enhanced-list
Their currently featured enhanced titles are:
- Forza 7
- Assassins Creed Origins
- Gears of War 4
- MiddleEarth: Shadow of War
- TitanFall 2
- Rise of the Tomb Raider