One trick is to hit F10. That cycles from the normal HUD to a version with most windows set to a visible black background, to a version minus all windows, back to the normal version. I find the black-windows version handy when trying to position windows, since most of the windows will show up. The group window is one, so hitting F10 once and then possibly Alt-G should make it pop up if it exists. It may be hidden under something.
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