Creating a book means working in, and often switching between, two views. Each view has its own tools and options.
In All Pages view, iPhoto shows little thumbnail versions of each page in your book, as shown on page 113. This is the view to use when you want to rearrange the order of pages or just get the big picture of your book so you can quickly jump around within it.
When you want to work on a specific page, double-click its thumbnail in All Pages view. This is page spread view, where you can place and rearrange photos, change page layouts, and much more.
To switch from page spread view back to All Pages view, click the All Pages button at the top of the page view.