In the `book` template, the sidebar is rendered on the left side. The sidebar tree is determined from the directory layout of the Markdown or Org files.
The sidebar tree is collapsed by default. But this can be disabled by setting
false in YAML configuration
The ordering of children in the tree is determined in the following order (this is also the order in which Obsidian-style queries results are rendered by default):
template.sidebar.folders-first is set to
false), directories are put before single notes, respecting the other order criteria. Otherwise, directories and notes will be interleaved.
order frontmatter metadata exists, use that as the primary sort key.
If the note has a H1 title, use that as the secondary sort key; otherwise, use the note filename as the secondary sort key.