There’s no way to set it as default completely. You can set it as default for titles that Valve hasn’t explicitly overriden, but if Valve decides that a certain game works with Proton 8 or Hotfix, it will automatically install those. I really wish there was a way to force Experimental in all cases.
Why do I have to click this box? Why isn’t the default option. I just want to click on a Windows game and then install. I’m I alone on this?
You can enable such an option in the settings
There’s no way to set it as default completely. You can set it as default for titles that Valve hasn’t explicitly overriden, but if Valve decides that a certain game works with Proton 8 or Hotfix, it will automatically install those. I really wish there was a way to force Experimental in all cases.