Reply to: Window overlays topicMarch 5, 2019 at 7:31 pm
Aha, oops, yes this is an XMetaL Author feature. It is new to 12 I believe.
Pressing Ctrl+Tab activates this window and allows you to navigate between all the various windows in XMetaL Author as well as switch documents.
If you aren't holding the Ctrl key down on purpose perhaps it is being activated by a sticky keyboard or something.