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. (deprecated, use navigation: virtual instead)
expanded	Defines whether the section is expanded on page load. (deprecated, use navigation: expanded instead)
navigation	Controls how the section appears in navigation. Options: default (collapsible section), hidden (hides from navigation), virtual (items appear at parent level), page (renders as a regular page link without showing children), expanded (section is expanded by default)

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.