Hello,
Thanks for the quick response.
I don't have any video screen capturing software and I don't want to go through that procedure.
You can see the image below.

If I drag the above group holding it from point A (gray area), I can continue to point B (under the taskbar). At normal conditions, when transferring a window, the pointer should stop at the top of the taskbar. In my case it allows the grouped window to move further down. If I release the pointer at B, then the group is no longer accessible (because the title bar it's under the taskbar)!
This happens for any windows combination that involves programs for which the tabs are created above the title bar (such as Microsoft Office).
I have Windows 10 Enterprise 1909 build 18363.778 and Groupy version 1.32.
Regards,
John