This question has been answered several times.
To change the resolution, go to FreeFlight Pro / Settings / Video.
Along with with the resolution, you can change the video quality (bitrate) and the framerate.
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It looks like this is a common and unanswered problem on the forums. Have you come across any solution to this? Have parrot just gone quiet about this or something? The support around this seems to be worse than a dead kickstarter project. I'm somewhat astonished that the option would be missing, or that it would be so hard to find.