You can manage the books and folders that you create in an electrical
project.
Books
A book contains all the drawings that make up an electrical project. A book can
contain folders, drawings, and all associated documents. You can have multiple books
in an electrical project if required.

Folders
A folder is a directory for storing drawings or other folders. You can use folders to
classify or group drawings within an electrical project.

Books and folders are identified by their mark and description in the dockable
panel.