Hi,
I’m not sure what you mean by ‘elements preview’. As it stands the preview messes up the first section with the call outs, all of which have been made inside the content builder’s settings. So nothing to do there with third party plugins. Initially when I made the page even the borders were previewed just as they should be.
The sole culprit in this case was the separator, regardless of parallax or not. BTW the separator does work when the section has a parallax image, you just have to use ‘angle out’ for it to be seen. As it was originally the first section had a parallax image ánd the bottom separator was set to ‘angle outside’ resulting in what I wanted: an angle inside the second section.