The Zoom Tool lets you zoom in and out of your page. When using the tool a zoom window will appear on the top right side, allowing you to zoom in and out, move around on your page and change to a specific zoom-%.
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Zoom |  |
Zoom Out |  |
Area Zoom |
The Area Zoom lets you mark the area you want to magnify. Tap the Area Zoom icon, and use the marker to circle the object you want to magnify.
Area Zoom is only available in Quick Sheets and Notebooks.