UICollectionViewCompositionalLayout with horizontal Sections

How can I create a UICollectionViewCompositionalLayout but where the sections are horizontally aligned instead of vertically.

Code Block language
Section 1			Section 2			Section 3
Item 1				Item 1				Item 1
Item 2				Item 2				Item 2
Item 3				Item 3				Item 3
Item 4				Item 4				Item 4

Right now I have code that runs and looks like this

Code Block language
Section 1
Item 1
Item 2
Item 3
Item 4
Section 2
Item 1
Item 2
Item 3
Item 4
Section 3
Item 1
Item 2
Item 3
Item 4

Ultimately, I'm trying to create an "Excel" like grid using DiffableDataSource and CompositionalLayout, but I need the sections to be aligned horizontally.