Zusty has four breakpoints by default. You can even extend it. Learn more about extending breakpoints.
Breakpoints are
smallmediumuntil-largelargeIf a modifier says that it has support for breakpoints. Then the modifier can be applied in this way for any breakpoint only modifier-class@breakpoint-name.
Here's an example
You may know, you can use zust-hidden class to hide any element.
What if you want to hide it only on small screens?
Simply use class zust-hidden@small.