If a moderator disappears and the community remains “uncovered” can an admin somehow change the sidebar and community title?
The only workaround I have found is to create a dummy user, make him a moderator, and then from that user make the changes. It seems a bit of a silly spin though, I think an admin should be able to do this without workarounds.
The admin on an instance can change whatever on the instance.
The admins are the moderators on their instance now, managing federation and interaction with outside users.