Set external monitor as default on X11 works fine, but would like to do it on Wayland too but don’t know how.
May be you want to upgrade your system first and take look if after upgrade you can change the primary monitor. If you still can’t change the primary monitor, may be you could try with this forum solution.
Think simply moving (dragging) the panel over to default monitor will be fine by me.
Time to get better acquainted with Windows placement settings…