Section Configuration🔖

Each folder inside book defines a section. Each folder must contain a index.md. The index file can be configured like a page.

You can also make folders virtual. If a folder is declared virtual, the folder will not create another level. This is helpful if you want to structure your hyperbook with folders, but they should not affect the navigation.

To summarize, here are the properties you can set in the frontmatter:

Property	Description
...	Every Property from a page
virtual	Everything will appear on the same level as the parent. Be aware that the index property does not work across folders.
expanded	Defines whether the section is expanded on page load.

If the index.md file only contains a front matter and is otherwise empty, it will appear in the navigation as a non-clickable item.