If you click the little eye icon on the top bar of the Designer, you will see a Preview of what your site will look like after published. Custom code won’t run there, so may not be exact, but is generally a good place to start. Intro to the Designer | Webflow University
If you are looking for a list of changes that were made, there is a feature called Site Activity log that is available for Enterprise customers. This shows a list of all changes made in the designer. Site Activity log | Webflow University
I don’t want a preview, I want an exhaustive list of the things that will be published. It’s something that everyone should really have before publishing changes, imho.