Same issue with multiple displays. When switching between monitors onto different Groupy windows the tabs disappear. Any groupy tabbed window appears as a normal windows dialogue, that is without a top group.
Sometimes the Grouping reappears only to disappear again.
On monitor 2, groupy window the Tab group is missing but there is a gap where it should be.
When opening a single groupy group the tabs never stay arranged how I originally saved the group. That is e.g a three tab group saved as 1, 2, 3 changes order every time e.g. 3, 1, 2,
Basically the program is unusable & unreliable - Windows 11
I have asked for a refund several times but I am being ignored!