As per this comment, I’ll make a separate feature request from it:
How about a Minimap, as Sublime Text, Atom, and other editors and IDE have it?
(Personally, I don’t have that many long documents in my second brain, but I really dig this feature in source code editors.)
Possible duplicate / merge candidate for this thread regarding an in-document outline.
I like this idea and definitely think it would make navigating longer documents easier. In the meantime, my current idea for a workaround is to create a “Table of Contents” (TOC) document to keep open while working on a long document. This TOC document could contain header links to each main section of the long document.