I was able to fix it after searching online, but it has happened again, so I thought I would post here in case anyone knows what might be causing this. (Also, I don't remember what It did, sorry.) In the screenshot below from hitting ALT-Tab, you can see how the instance is smaller than other running programs and also the close and maximize buttons are greyed out. When I select XYPlorer with ALT-Tab is stays hidden.

Any suggestions?
Thanks.
Windows 11 Pro 24H2, 26100.4946
XYplorer Beta Club