FWIW
My UI resolution testing process is this:
- I open the game from the executable icon in the Windows folder.
- The game opens in the 1080p monitor by default.
- The UI works fine in 1080p.
- I use the command, r.setres 800x600w to resize.
- I move the resized game window to my 4K monitor.
- R.setres 3840x2160f
- The 4K UI is off-target.