If you found this and upvoted it, please upvote this one as well that currently has more votes: https://sharepoint.uservoice.com/forums/329214-sites-and-collaboration/suggestions/34333117-allow-creation-of-headings-sections-without-link
This should be default. I've seen variations of this comment multiple times on UserVoice. If they were all collected together, this would have a lot of votes.
I thought this would be fixed in the new mega menu, but alas, it was not.
231 votesnot in our plans right now · AdminSites Product Team (Product Owner, Microsoft SharePoint) responded
Thanks for asking for this capability. This isn’t in our current plans. We suggest using the Group Calendar functionality for great Microsoft Exchange backed features like recurring events.