This is an annoying bug that has been around since Logos 8. I reported it for Logos 8 here: https://community.logos.com/forums/t/183251.aspx. I cannot believe that it is still around two generations later in Logos-land.
When I switch from Logos to another program using the Alt+Tab key, the Logos selection menu does not go away. It stays on top of whatever program I change the focus to. The only way to get rid of it is to switch back to Logos and click someone on the program.

From my experimenting, this bug does not occur when I change the focus to a different program with the mouse. It only happens if I use Alt+Tab, which I do a lot (e.g. when changing from Logos to my Microsoft Word, while I am writing.
In earlier Logos versions, this bug would occur with the updates list and the Context menu. Logos has fixed the persistent pop-up with those, but not with the Context menu.
*Windows 10 and Logos 10