Using the zoom controls
Use the zoom controls Zoom control buttons (located at the bottom of the document window) to enlarge or reduce the image on your screen.
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Note  In Windows, you can only zoom in to 300% when Enlarge window contents to improve readability is selected in the General tab of the Preferences dialog box.
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Tip  If you can’t use the zoom controls, it is likely that a script has been performed that locked the zoom level. To restore the zoom feature, run a script that has the Zoom Level script step with the Lock option turned off.
Note  You can also access the zoom controls by choosing View menu > Zoom In or Zoom Out.
In Windows, you can use a scroll wheel to zoom in and out. See Scroll wheel support (Windows) for more information.