How to reduce the quantity of inside pages in your book
Open your INSIDE pages in your cookbook. Click the symbol at the bottom of the thumbnail as shown in the image below circled in red.
This is the grid view. To view more pages on a page go press the minus "-" as shown in the image below circled in red.
To delete one page, click on a thumbnail so it highlights in yellow and press delete. To delete multiple pages, click on a thumbnail so it highlights in yellow, hold down the Shift key and click on additional pages. Once selected press delete.