Same problem here .... luckily the Browser can be used to switch (My Library/start different server)
The button is missing on both the App and Brower ...
https://prnt.sc/w2hze4 (browser)
https://prnt.sc/w2i25v (app)
Update: although it seems a workaround, it is not. I am stuck on the same server no matter which server I select.
This is bad news !