> Zooming and Panning the Canvas
> You can zoom in and out on the canvas to view details or see the big picture.
> To zoom in or out on the canvas, use the scroll wheel or use these commands:

> • | Zoom in—select View > Zoom In (Command-=)

> • | Zoom out—select View > Zoom Out (Command--)

> • | Zoom to full pixel size—select View > Zoom to 100% (Alt-Command-0 (zero))

> • | Zoom to fill the pane at its current size and shape—select View > Zoom to Fit (Alt-Command-0 (zero)).

> When the canvas is larger than the panel, scroll bars appear so that you can pan in any direction to view hidden portions of the canvas.