Select the Zoom tool , and
click either the Zoom In
or
Zoom Out button
in
the options bar. Click the area you want to magnify.
Select the Zoom tool. The pointer becomes a magnifying glass with a plus sign in its center. Click the center of the area that you want to magnify, or hold down Alt (Windows) or Option (Mac OS) and click the center of the area that you want to reduce. Each click magnifies or reduces the view to the previous preset percentage.
Select the Zoom tool and drag a dotted rectangle, called a marquee, around the area you want to magnify. To move the marquee around the artwork, hold down the spacebar and continue dragging until the marquee is in the desired location.
Choose View > Zoom In or View > Zoom Out. When the image reaches its maximum or minimum magnification, the command is dimmed.
Set the zoom level at the lower left corner of the document window or in the Navigator palette.
To display a file at 100%, choose View > Actual Pixels.
To change the view to fit the document window, choose View > Fit on Screen.
Select Zoom All Windows in the options bar, and then click one of the images. The other images zoom in or out at the same time.
Choose Window > Arrange > Match Zoom. Hold down the Shift key and click one of the images. The other images zoom in or out at the same magnification.
When Resize Windows To Fit is deselected (the default), the window maintains a constant size regardless of the image magnification. This can be helpful when using smaller monitors or working with tiled views.
Double-click the Zoom tool in the toolbox.
Choose View > Actual Pixels.
Enter 100% in the Status Bar and press Enter (Windows) or Return (Mac OS).