The feature was initially only available in Beta client, then made for stable. And, according to this post, it will probably enabled by default in near feature! Enable Proton for Linux Steam Client. NOTE: Not all Windows games are playable through Proton! See this page and changelog for list of supported games., Valve has quietly updated the Steam Beta Client to enable Proton by default for all Windows games on Linux, eliminating the need for users to toggle compatibility settings manually. GamingOnLinux reports: For some context here: originally, Proton had an option to enable / disable it globally. That , Learn how to enable Steam Play on your Linux system, and start playing your Windows games. In this tutorial you will learn: How to Install the Steam Beta Client. How to Enable Steam Play. How to Configure Steam Play and Proton. How to Play Your Windows Games. Play Windows Games With Steam Play., Steam Play (aka Proton) is a compatibility layer provided by Valve to help run games developed exclusively for windows under Linux. The game devs have no obligation to support this and the feature is in beta so there is also no Valve support for it yet, but it works very well for thousands of games already., Valve and CodeWeavers today announced the much anticipated beta release of Proton 10.0 as the newest version of their downstream version of Wine that powers Steam Play for running Windows games on Linux. Proton 10.0 is re-based against the recent Wine 10.0 stable release., .