I did not understand where I should write these commands, because writing them in the console did not work.
Ah!
One of the solutions used launch options, which can be set in Steam if you right-click the game in your Library and go to Properties. If you're running the standalone game from itch though, I'm not sure how you'd do that.
Another solution was using PlayerPrefs which on Linux is stored in:
~/.config/unity3d/Matt Glanville/Switch 'N' Shoot