I’m a step further with help from
https://docs.software-univention.de/manual-4.4.html#central-management-umc:Assignment-of-portal-settings-module
https://help.univention.com/t/groups-admin-delegation/17718/3
Now I have a portal with only the tiles I like and the users in this group can manage group assignments. But I like to give them permission to add users.
Please help.