Wag the dog

Regular dental checks are really important for cats, I"ve learned. They can stop eating completely due to deteriorating teeth and once the problem has reached that stage it’s quite difficult to reverse.

Penny Dreadful

Liftoff. The UI isn’t anything to write home about, but it has the best features for managing multiple accounts across different instances out of all that I’ve tried by far.

As others have said, it currently does not. A workaround that works pretty well, and which I use, is to create accounts on multiple instances and use them as “multi-lemmies” by moving your subscriptions between them according to theme, topic or whatever else you want to group by. A password manager like Bitwarden can help with generating passwords for and keeping track of the different accounts.