Does it have outline view yet? One way or another it's been an outstanding RFE for over a decade:

Open Office: https://bz.apache.org/ooo/show_bug.cgi?id=3959

Libre Office: https://bugs.documentfoundation.org/show_bug.cgi?id=38262

I have a half-hearted look for it every time I fire up a new version of Open/Libre office but I've stopped bothering to check for it actively.

Seems baffling to me that this wouldn't be a higher priority issue as this seems to be the commonest mode of use of Word for creating new documents - where the absolute commonest mode is using an existing document as a template and forgetting to change headers, metadata, and random boilerplate text throughout :)