How can I make a variant push other elements inside an Auto Layout when resized?

Hi! I saw a prototype where clicking on a circle inside an Auto Layout made it expand horizontally, and the other elements next to it were pushed automatically — no frames, no manual resizing. Just Auto Layout and Variants. 

What am I missing to make the expanding circle push the other elements inside the Auto Layout using Smart Animate?

Thanks!

(The light blue example is something that works as expected, it’s from the project that I took to study, and the dark blue is mine, and it doesn’t work, even though I tried to replicate the setup, but if it’s not working it’s because I’m missing something, but I don’t know what. It just overlaps the other item)

Can someone explain to me how to do this?