Ah.

GloriousEggroll keeps a version of proton that uses all of steam updates plus additional updates made by the community (to fix odd issues) and protonfixes (a database of scripts to make the weird game-specific configurations you need to make sometimes). I use it exclusively because I've had issues with regular Proton. I think the default Proton versions are still version 9(or there's an experimental Wine 10 version). GE-Proton10 is using Wine 10, so it has support for native Wayland and HDR.

Your distro probably has protonup-qt in its repo. It's a GUI to download and install various community proton versions. Just run it, click install new version and grab the latest GE-Proton10-(28?) and restart Steam and it'll show up in the list of Proton versions that you can pick.