Question How to join a new world

Hey guys
Presently I am playing on one server. Atm exclusively on mobile. How do I join another server.
I have tried but can't find anything that works.

Silver Witch

On the mobile you select 'leave world'.
That gives you the worlds you play in your current server - top right of the screen click blue book - that logs you out completely.
Then on the login screen top right there is a flag - click it.
There is a list of all servers - select the one you want.

Try that - i think thats what you are asking for.