This update enables support for hi-dpi displays, and switches to 64-bit support on Windows for improved performance.
If for any reason you cannot use the 64-bit version (rare) or otherwise want to revert, the previous build is available as a beta branch called "version_3_0_1_archive". Here's a post on how to switch to a beta branch: https://steamcommunity.com/sharedfiles/filedetails/?id=380122528
(Right click on the app in your library, choose Properties, navigate to Betas, and select from the drop-down. No password needed.)
Cheers!