Thanks Basj. I cannot do a video or screenshot right now, but I'll simplify my question.
I configured tab appearance to show on active windows.
I have 3 notepad windows grouped in groupy. I am working in first notepad (tab #1) which is the active window. I click on windows taskbar causing notepad window to lose focus and groupy tabs on notepad windows are hidden as expected.
Now, I click the first notepad window so that it gets focus and it becomes active, but the groupy tabs are not shown automatically. I have to hover above the titlebar to make tabs appear.
See, I expected the tabs to appear when first notepad window became active.