"Disgusted" was a fast choice for wording. They look confused. Someone told me he get a headache by the fast movings through the workspaces.
For explanation I use 3 or 4 workspaces with full max. Windows and switch through them with super + tab. And had this wiggle animation running, too. As an user it is really fancy but if you are watching, it could hurt.
Looks like you need a closer view about actual functionality. Jellyfin supports movies, tv-shows, music (there are also apps just for music), e-books and live-tv.
Btw. I sometimes look at their development, I wait for a production ready docker compose setup. Using a config.ini instead of an .env file makes me sceptical.
Got an invite, too. But without an app there is nothing you can do, just change password and write a bio.