Yeah, I meant the upgrade to win 22H2 - and this time I succeeded.
But it did not make a difference about my ability to remove the apps group - any group actually. I played with this some more to get an idea if there is something I can do to make it work. But nothing: (all on a second page) make a new normal group or app-group, put them together into tabs, the command to delete, group or even tab and all group, and even page, just don't do anything. I have seen it work in the past, and there was a confirmation dialog - that is not displayed at this time.
Cheers,
Gunter