Why do all pages for a book show in the edit pane

When creating a book, in the pages panel, Left side, all the various types of page layouts appear to choose from.

All the various formats are great compared to iPhoto.

HOWEVER, they all appear in the main edit, (add photos panel).

It gives the appearance that all the pages will be added to the book purchase.

Is there a way of only showing the pages that I assign for the book to appear in the main window, Photo pages ?

Greg