In a Catalyst app, I have SceneWindow in which is placed a UICollectionView with a UICollectionViewCompositionalLayout. I can use opt-left and opt-right arrow to get it to scroll left/right, but it will not respond to the mouse swipe.
Adding a UITapGestureRecognizer to a cell gets handled properly.
Various "enables" of Scrolling, UserInteraction, Paging for the collection view have no effect.