Can you add a 'Close All'' button to Groupy title bar?  The functionality is there, but the UX could be better.   

Right now, to close all windows:
1) Click on the triple vertical dot button (not sure what it's called).

2) Search through the 9 menu options to find the "Close all windows in this group" menu and click it.

That might not sound like a lot, but Step 2, could be completely removed if you just added a "Close All" button to the Groupy title bar. 

Sometimes, it's the small changes that make the big difference.  There would be two main advantages:

1) It eliminates a mouse click.

2) More importantly, you don't have search through 9 menu options to find the one you want.