@BigWheel: Whatever you did, it worked! Thanks so much for your help.
I’m still not sure how my other account got associated with MaxAbider and eventually took over my server. If anyone has any thoughts on how to avoid repeating the same mistake, I’d love to hear it!
It happened because on your other account you chose “invite home user” then on your MaxAbider account you accepted the invite. which puts you in the “home” of the other account. Then when you deleted that other account things got screwy.
You were still the admin of your server, that is why the “Share libraries” button was still there.