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Unable to resize GTK4 windows on Gnome 40
I'm afraid you don't seem to be very active (last activity 5 months ago). So I hope things are alright. At the moment on Gnome 40 when you enable GTK next you cannot resize GTK 4 windows.
Reproduce this by opening the gnome extensions window, then trying to resize that. It is not possible with this theme, but switching back to adapta it works fine. There are numerous other GTK 4 issues which need to be fixed now that that is officially stable