4k or 5k monitor attached to my Mac
If you have a 4k or 5k monitor attached to your Mac and notice Luna Display isn't running properly, try removing the monitor to see if there is any difference.
Luna Display hardware cannot be plugged into the Mac on the same side as a 4k/5k display, and we suggest plugging Luna into a port on the opposite side of the display.
If a 13" MacBook Pro (with USB-C ports) is in use:
Plug in Luna Display to the MacBook Pro first, with both apps running, and then plug-in the 5k/4k monitor afterward.
Try the orientation monitor left side port, Luna right side port.
These steps should get this specific setup to work when using 13" MacBook Pro + 5k/4k monitors.