If you have Microsoft Excel in a group and you minimize that group from ANOTHER active program-tab, then move your mouse over to the location where the edge of the Excel window would be if it was still maximized, your cursor will change to a double-arrow and you'll be able to interact/resize it, despite it being minimized.

This means that I must ALWAYS minimize the group from the Excel tab, otherwise I might accidentally resize/interact with Excel while it's minimized.

NOTE: If you minimize the Excel tab and then maximize other tabs, the issue won't reoccur until you maximize the Excel tab again, THEN minimize the group from another tab. In other words, once you minimize the group from the Excel tab, the bug won't occur until you navigate to or maximize the Excel tab again.

I'm using Groupy 1.19 on Windows 10 Home 1809.