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On the View tab, selectÂ
  Zoom Out or  Zoom In. - 
                          
You can selectÂ
  Page Width,  Zoom percentage level, or  100%. - 
                          
Use Ctrl+Mousewheel, Ctrl+-(minus), or Ctrl+=(equals) to zoom in and out.
 
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On the View tab, select the down arrow next to Zoom to choose a percentage to make a page larger or smaller, or to Fit the view to the window.
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On the View tab, select Zoom to 100% to quickly get back to actual size.
 
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To make a page view smaller or larger, on the View tab, select:
  Zoom Out or press ⌘+= (equals)  Zoom In or press ⌘+- (minus) - 
                      
You can also select View and chooseÂ
  Page Width, set the Zoom percentage level, or  Reset Zoom.