So Yesterday I partied with a friend and we both left without unpartying. I dont know the button to manage teams like disbanding parties, leaving or kicking someone out, and it wont let me go on missions unless both members are online.
There should be a button to the bottom left of your character's picture (in the top left corner of the screen, above the party list; it has the image of an open door on it) that appears when you're in a party. Click it and you can leave/disband the party.
