Style selector "duplicate" not working

I am following a Webflow university video, and it says to select duplicate class from the drop-down of an existing class. However, it just seems like a dead link. I can “rename class” just fine but when I try to use “duplicate” nothing happens.

Thoughts?

im 6 months late but i had the same issue, the work-around is shortcuts: command+option+enter after you’ve clicked on the class you want to duplicate. hopefully they fix this