I started to create my first book, but after reading the documentation and playing around with it, I still can't figure out how to create a chapter hierarchy.
The documentation page has main chapters (1, 2, 3 ...) and sub chapters (1.1, 1.2, 1.3 ...). How do I do that? From the article page I just seem to have the option to add the page as chapter to the book itself, making it a new top level chapter.
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