There is but it only applies to games without Linux versions. The default behavior is to install the Linux version and, if it doesn’t exist, install the Windows version and use Proton.
In order to install the Windows version you have to check the ‘Force the use of a specific Steam Play compatibility tool’ for that specific game and click the update button to download the Windows version.
I think there already is an option to enable proton for all titles instead of doing it for every one separately.
There is but it only applies to games without Linux versions. The default behavior is to install the Linux version and, if it doesn’t exist, install the Windows version and use Proton.
In order to install the Windows version you have to check the ‘Force the use of a specific Steam Play compatibility tool’ for that specific game and click the update button to download the Windows version.