The Field Of View lets you change the field of view, or zoom to a particular region.
This flyout is available only for Perspective viewports. Right-click the Field of View (FOV) or Zoom Region icons to open the
Viewports Configuration dialog, which gives you settings for controlling the viewport.
The flyout has two options:
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Field of View (FOV): Adjusts the amount of the scene that is visible in a viewport and the amount of perspective flare.
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Zoom Region: Magnifies a rectangular area you drag within a viewport.