To test and try some features I installed Nextcloud as well as SOGo. I read there may be some incompatibilities with CalDAV etc if trying to use both so I uninstalled Nextcloud using Software Centre.
But its not dead! I can still connect to my Nextcloud and see al the test data I input.
Nextcloud does not appear to be installed, its available to install again in Software Centre. I can log out and back into Nextcloud, and the same is true when I use a browser on another computer, so its not just a cache.
How can this be? How do I correctly uninstall apps like Nextcloud?