Duplicate content issue

I have two custom domains registered through Webflow: one with and one without “www.” However, this is causing duplicate content as both versions of the site are seen (according to Moz). Is there a way to fix this?

need help on this too, having same issues am i missing something?

I would like to know if this has been resolved as well.

Another reason that keeps me from signing up again with webflow hosting.

This is a very BIG ISSUE that “IMO” should be addressed.