Hi Stardock,
I just installed Groupy and it seems it's not quite fully compatable with PowerToys. I'm not sure if this is more of a PowerToys issue or not, but I thought I would share it with you incase it's a fix that can be implemented on your end. When you assign a window to a space in PowerToys it extends the window to the top of the display but doesn't recognize the added window height created by Groupy for the tabs which pushes the tabs off the top of the display. I managed to create a custom layout using the PowerToys 'Focus' feature where the window area that I want to use with Groupy is a little shorter at the top to accommodate for the tabs which was an easy workaround for now, but thought I would share this behavior either way.
Best / Travis