Zoom in and out notebook previews in the gallery view.

1. Open the Noteful app. 
2. Tap the button Notebooks where you keep all your notebooks. 
3. Tap the button Format List, at the top of the app to switch to the gallery view to preview all notebooks. (Tap again to switch back to the list view.)
4. Place two fingers and spread them apart to enlarge the size of previews. Move two fingers toward each other to zoom out.