The preference "Use the wikitext editor for editing sections while VisualEditor is in beta" should be enabled by default.
More generally, users have the option to use or not to use the VisualEditor at the top of the page, but not at the section level. Some users in the Hebrew Wikipedia complained that it's disruptive, and I agree with them.
Another possibility is to have two section edit links, like it is at the top of the page.
Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=49666