Ok, I installed Windows 11 insider preview. It has an updated file explorer with a new bar which looks like this:

but with Groupy installed it looks like this:

If I turn off then back on Groupy it looks like this:

Close and reopen file explorer and it has the black bar again. 

Yes I know Windows 11 is just an insider preview at the moment and it just got released but a bug I thought I'd report.

Would be nice if when it does get fixed it can blend better with the new bar. In the third picture, the tab doesn't match with Windows 11's new rounded corners they added.