You install it from within Steam, or using flatpak if you’re installing Steam via flatpak [Proton on flatpak has reached EOL, try installing via Steam instead]. Then in settings you set it so every game uses the Proton compatibility layer, or whatever it’s called. You don’t have to do it per game, it’s a global setting (as well as a setting for each game if you prefer).
I can’t answer for a specific game though, you’d have to simply try it out or check a database which has info on games that can run using Proton. I don’t know the site from memory.
Same experience on Linux for me. Install Steam, install Proton, set it to be default for all games. Click and play. 🙂👍 Not really “fiddling”. It’s a one-time thing that I equate to just installing Steam. Very good experience.
Even if there’s a reject button, still freaking annoying when you start reading and after two seconds you get interrupted by the prompt.
It used to be just the newsletter prompt, the notifications prompt, etc. Don’t need an additional thing by law. 😑 Let’s hope it goes away soon with the current developments.