Add sections to the bookbuilder: Radical books for kids (Egg Syntax
Radym
)

 

With complex structures, e.g., a chapter with subsections, selecting only the chapter is likely to select only the chapter's title, so probably you want to select the chapter and all its subsections.

The text structure is shown below.

 
Section
Select
Title, author, date...
Radical books for kids
Source, notes...