I use a laptop with a docking station on my windows version of Lightburn (ruida controller) . When docked, I have 2 monitors and the preview is set to come up in the second monitor. If I just undock and pick up my laptop without moving the display back to the laptop display I will lose the preview and can not get it back until I redock and manually move it. I have even exited Lightburn and rebooted the laptop, I still do not get it back.
I hope this makes sence