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 Book [[note]] is a type of note which displays all its children's content in a linear fashion so you can read note sub tree like a book. This can be useful for reading many smaller notes. Seeing an example might explain this concept better:
 
+[[images/book-note.png]]
+
+Notice in the tree on the left pane how "node.js" note has some children and these are then displayed on the right pane.
+
+This note type can be zoomed out like this:
+
+[[images/book-note-pictures.png]]
+
+To zoom-in and zoom-out you can use buttons or you can set [[label]] `bookZoomLevel` to value between 1 and 6 - which signifies number of columns (1 means each note takes full width of the right pane).
+
+Note that book note is available since Trilium 0.36
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