OpenBSD works great with a few annoyances.
- The VM mouse pointer (openbsd) is always somewhere that is not where the host (qubes) mouse pointer is.
- The window max size is limited. I have found some configs for this, it did make the window bigger but the desktop did not seem to catch on, blocking the mouse and apps from using it.
- The desktop is larger than the host window, enough to block taskbar icons in things like xfce.
This is in reference to openbsd 7.5 and earlier.
Any help appreciated!