I have never seen that option. To do vertical shots, the Mavic 4 Pro does "true" vertical shots, meaning the gimbal rotates to do so. There is no need for a vertical crop.
Ok... So in the this video I take a mid October ride on my motorcycle out to a location in the Southern Tier of Western NY to get some Mavic Air 1 video of some tree tops at maximum peak foliage. My helmet is fitted with a 1st generation DJI Osmo...