After creating a page and applying a master page design, you may need to add more photo boxes to hold photos on the page. You can select a different master page design that has more photo boxes, or you can add photo boxes where you need them.
In the Book Layout Editor, click the Edit Layout button, if it’s not already selected.
Select a page in the Pages pane.
Choose Add Photo Box from the Add Box pop-up menu (+) next to the Edit Layout button.
When the photo box appears, you can drag it to a new position and resize it.
After creating a book page and applying a master page design, you may want to remove one or more photo boxes from the page. You can choose a different master page design that has fewer photo boxes, or you can manually remove photo boxes from the page.
Click the Edit Layout button, select a photo box or boxes, then choose Edit > Cut (or press Delete).