I have tried clean boot. It works but not fine. The windows explorer has that tab but not convenient to use. I failed to combine thoese windows though dragging.
However, I cannot find out what conflict it is. I shut down most of my apps and Groupy is still not working.
As I have said before, Groupy works a bit for 'cmd' in admin mode. Check this pic.

As is shown, if I move the window, the tab will split for a while.
I can only use 'add to group' to take other windows in, but it acts slowly.
Thanks for your kind support.