You can with a smaller aperture (less light in) "force" a longer shutter to compensate & by that get a smother video clip by introducing a small amount of motion blur... this is why you might need ND filters on fix aperture cameras.
Both longer focus distances, shorter focal lengths (wide angle lenses) & smaller sensors makes the DoF wider in general... all these factors hugely affect drone photography/videoing, this to the degree that a bigger aperture can't mitigate the...
You should use the discontinued "DJI Assistant 2", for windows it has version 1.25.
You find it here --> Mavic Air - Download Center - DJI United States & there the "Parameter Adjustment Software" tab in the top