Prepare for a few headaches with anything that is running through ea craps. I had quite a few with titanfall 2. Everytime ea launcher updates, break the game and I have to delete (just rename as a backup measurement) the game prefix directory so proton would rebuild it again.
The game prefix directory (if that is how it's called) is located in ~/.local/share/Steam/steamapps/compatdata/
The game id is in the url of the game page in steam (https://store.steampowered.com/app/1237970/Titanfall_2). That makes it 1237970 for titanfall 2