Perspective
The perspective commands change the amount of distortion used to display the drawing, which gives the impression of 3D perspective. Select from normal, narrow, or wide perspectives, or create a custom perspective.
 
To select a perspective:
Select View > Perspective, and then select the perspective.
To set a custom perspective value, select Set Perspective. The Set Perspective dialog box opens. Type the custom perspective value in the Perspective field, and then click OK. The lower the value, the wider the angle of perspective.

Viewing and Rendering : Perspective

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