The camera interface (settings and shooter) are not present while executing mission. Never saw this restrictiin before in any other app. I see no reason for that neither. One should be able tobstart / stop video during mission or change settings. Its just basic
The FPV camera interface is accessible by pressing the top right camera button once the drone is correctly connected.
During the execution of autonomous missions the camera is busy and controlled by the DJI mission execution code. If the operator would change camera settings at the same time concurrent unpredictable behaviors can happen or DJI might reject some operator commands. Thus the camera controls available to the operator are automatically limited by Drone Harmony at the time of execution of an autonomous mission. Nevertheless, in order to change "more sophisticated" camera settings simply pause the mission first, adjust camera settings and resume the mission.