Party / Party
To leave the current duty, select Duty Finder under Duty in the main menu and then select the Leave button in the Functions tab of the Duty menu.
Please note that a penalty will be incurred if you join a matching party and leave it before the duty is complete or participate in a duty roulette with a preformed party and leave it in less than 10 minutes.
The Duty menu can also be accessed by selecting "Duty Information" in the duty list on your HUD.