Luuk In Relume you usually see Sitemap and Wireframe buttons at the top. Now they have a Styleguide (beta) button that you can use to create style guides and preview them.
I am guessing that it will affect what gets imported into the Webflow Styleguide when you import the style guide into webflow, but I don't know for sure.
I've only seen the feature at a glance but it shows you how the website will look and it even has images and stuff.