Interesting development. I used the Dynamic Content Index/Detail for my Portfolio items and all works fine so far. However, for my News articles, there are a couple hundred of those existing as Joomla articles, so having to recreate them all as Dynamic items would be tough. Thus following the above instructions, I used the New Articles Details and Index Pages, which (mostly) works fine.
However, with my topper Section added to both the articles Index and the Details pages, that text/parallax section works just fine staying tight to the menu bar in the Index page, and if you go directly to the Details page, it also works fine. BUT...if you go to the Index page first, then clcik one of the news items links to the Details page, then that same top section has an incorrect white space between the menu bar and that section.
Interestingly, that does not happen with the Dynamic Content Index and Details pages. All works well there. Maybe there's a fix availble?
I did delete the Articles Detail page twice and started over fresh, but both times the same result. Works fine directly going to the page, but when getting there from the Index page, the top section does not stay up to the top.
Thanks.
Link to the Articles Detail Page: https://geldemo.com/index.php?option=com_sppagebuilder&view=dynamic&collection_item_id[0]=147&collection_type=articles
Link to the Articles Index Page: https://geldemo.com/index.php/news
Link to the Portfolio Index Page (Dynamic pages): https://geldemo.com/index.php/our-portfolio