Setting masonry element column count based on screensize

Hi team,

This recent added feature isn’t working for me at all.

I can see that class names are added the element for example:

av-medium-columns-overwrite av-medium-columns-2 av-small-columns-overwrite av-small-columns-1 av-mini-columns-overwrite av-mini-columns-1

With this ^ I’m expecting 2 columns from 768-989px, and 1 column below 768px.

I can’t see these classes mentioned anywhere in the stylesheets.

Is there something I need to switch on somewhere that I might have missed, or any known issues?

Thanks!