It's baffling, but based on where the smart connector is rumored to be placed on the new iPad Pro models and the addition of FaceID in the top bezel, it seems that Apple is telling us that this is meant to be used mainly in portrait mode.
https://www.macrumors.com/2018/10/12/2018-ipad-pro-models-dimensions-no-headphone-jack/
https://www.macrumors.com/2018/10/12/2018-ipad-pro-models-dimensions-no-headphone-jack/