[While using VE, when a template displayed on the entire width is followed by a title, it is not possible to add a paragraph between those two items]
This is problematic when that template asks people to add information below that template. That's the case for the "expand section" template on fr.wp, displayed on the entire with of the article.
A video (in French) has been made by @Drongou to explain that: https://www.youtube.com/watch?v=WEsXCGCpPuY