How are we actually meant to use responsive font sizes?

[jeffmarshall]

Nothing changes when I resize my viewport with $enable-responsive-font-sizes: true;

I get that we should use rfs(size) for font-sizes in custom styles, but font sizes don't change when we scale down. How do we take advantage of this system of relative sizes.

[muhaimincs]

agree with you. How exactly should we consume this feature? should we install package RFS?