How to expand the basic list of categories.

categories

In the Library module, select the “Settings” tab from the top main menu.
Click “Enable categories”.

The categories that are already in use are highlighted in green. You can add categories from the list. To add all categories within a category segment, click the checkbox next to the segment title row (shaded in grey). Click Ok to confirm.

You can now assign categories from the expanded list.

See also:
How to add a new book title to the Libary module