Updated: In the updated whiteboard, the zoom feature can be found on the top toolbar. You can also hover over it to see the keyboard shortcut.
Sometimes you may want to look at your entire whiteboard to view everything at once or to work with a large group of product images. At the very bottom of the whiteboard inspector, there is a slider that will allow you to zoom the whiteboard in or out while keeping your interface the same size.
Zoom In – Focus on a specific area of the whiteboard page by moving the zoom slider to the right:
Zoom Out – See a larger area of the Whiteboard page by moving the zoom slider to the left: