Hey, same boat. I've tried FreeCAD and Ondsel (which is supposed to be a more intuitive version of FreeCAD)... But they are both so unintuitive that it drives me nuts and I just boot into Windows when i want to design something functional to 3D Print.
Luckily Blender works great on Linux for less functional designs.
Mini PC/PC with a script to run
gamescope -fe -- steam
on boot is as close as you'll get atm. That will run Steam in fullscreen embedded mode.I have a PC all set up for it but there is a bug with 10xx series NVIDIA cards that causes the screen to go black when the cursor is hidden. Very upsetting. Need to throw an AMD card in there.