How do you keep library secret door open in garfield scavenger hunt 2?

In Garfield Scavenger Hunt 2, to keep the library secret door open, you need to find the hidden book that acts as a lever. Once you locate the book, place it on the designated spot to activate the mechanism. This will keep the door open, allowing you to explore the secret area. Be sure to search carefully, as the book can be well-hidden!