You really should not be using NTFS for Proton gaming. It’s a hit or miss if it works on a game-to-game AND proton-version-to-proton-version basis. NTFS libraries are not officially supported with Steam’s Proton.
Also, if you play Native Linux games, and have it installed on an NTFS drive, it has chances to fail because NTFS doesn’t support symlinks.
If you absolutely must use NTFS for some odd reason, you can look at these links:
- https://www.reddit.com/r/linux_gaming/comments/nliqh0/steam_ntfs_the_secure_way/
- SteamNTFS/README.md at main · FizzleFuze/SteamNTFS · GitHub
You’ll more than likely won’t get support here on it though… because it’s not officially supported nor recommended.
You can read a lot of reasons why you shouldn’t use NTFS with Steam searching through /r/linux_gaming