In Image View, you can zoom in to display the details of a page, or zoom out to make the page smaller on the screen.
To zoom a page:
On the View ribbon, repeatedly
click Zoom
In or Zoom
Out respectively, to change the page size by about 5% on each
click
— or —
Right-click the page and click Zoom In or Zoom Out from the shortcut menu for a single step zoom of about 5%.
Tips
To see the current magnification of a page, check the Status bar at the bottom of the Image View window.
You can also use Best Fit on the View menu to fit the page to the best possible size within the Image View window.
On the View ribbon, click 
Fit Width, 
Fit Height, 
Best
Fit or 
Actual Size
— or —
Right-click the page and choose Fit
Width, Fit Height,Best
Fit or Actual Size from the shortcut menu.
Notes
The above settings are only valid until you view another page or toggle to desktop view.
Annotations, if any, are also affected by zooming operations.