I'm using `UICollectionView` for a list of `UIButton` of different sizes. In Storyboard, I set leading and trailing constraints for the collection view (20px each related to Safe Area). That's what I get:

[![result](https://i.stack.imgur.com/udH7H.png)](https://i.stack.imgur.com/udH7H.png)

As you can see, the space between cells (that I set in Storyboard) is increased in order to "justify" the cells. That's not what I want, I'd like to have fixed space between cells and eventually more space a the end of the row. Is it possible?