That's not what you said in the first post, was it? If I wanted to do that, I would but the buttons with two constraints to the bottom and to the trailing (rig

That's not what you said in the first post, was it? If I wanted to do that, I would but the buttons with two constraints to the bottom and to the trailing (right), and I would change the constants of those two constraints, it's even easy because it's just swapping the constants of the constraint pair.