Just making sure that folks are aware that there is another thread on this, from… 2019.
Based on the maybe status, it looks like we may be wasting our time providing this feedback.
Also, see my feedback in that thread: Swipe between screens in portrait and full-screen (e.g., swipe to switch cameras, back navigation) - #62 by krakataubox
I surely agree that the feature would be complete if the swiping is available in the horizontal view as well. There are ways to get around panning - depending on the location from where you swipe, or even arrows would do, as per a previous suggestion in this thread.
But again, this doesn’t look like anyone will do anything about it. Quite a shame.