How to change scroll direction of a collection view using UICollectionViewCompositionalLayout

UICollectionViewCompositionalLayoutConfiguration has a scrollDirection property. Changing it will affect the whole collection view.

You can also set orthogonal scroll direction for sections using orthogonalScrollingBehavior property of a NSCollectionLayoutSection. So, for example, if your collection view has vertical scroll direction, you can add horizontal direction for specific sections. This makes layouts like the AppStore or Music apps have trivial to do.