Ryan Hanson on medium.com:
With Catalina, Apple made some incremental updates to macOS’s built in window management, including the addition of default menu items for tiling windows left and right in the “Window” menu for an application. Interestingly enough, we can actually configure keyboard shortcuts for these menu items directly within macOS.
It didn’t even occur to me to configure with the default keyboard shortcuts functionality. Giving it a try this week in with a slight modification:
This way I can have both the full Window style and also the simpler move to side of same screen mode.