Use the outline sidebar

Short answer: Unmarked's outline sidebar lists every heading in the document, nested by level. Click a heading and the document jumps straight to it. It's how you move around a long file without scrolling.

Each # heading becomes a line in the sidebar, indented under the section above it, so the structure of the document is right there on the left. Headings that share a name each get their own line, so a "Notes" section under every chapter shows up every time.

Jump to a heading

1. Click the sidebar button in the toolbar, next to Home, to open the outline.
2. Find the heading you want in the list.
3. Click it. The document scrolls to that heading.

The outline works the same whether you're reading or writing. The list stays in sync with the file, so adding or removing a heading updates it. Seeing every heading nested in one column also makes a missing level or a section in the wrong place easy to spot.

See where you are

As you scroll, a marker in the outline shows which heading you're reading: an accent bar on a faint rail, with that heading's title in the accent color. It works in Read and Write, so a glance at the sidebar tells you where you are in a long file.

Note: A document with no headings has an empty outline. Add a heading where the subject changes and the sidebar fills in.