You can define the area of the scene that can be viewed through the camera in a 3D workspace only.
For the current viewpoint, you can move the FOV slider on the ribbon to adjust the Horizontal Field of View. For previously saved viewpoints, you can use the Edit Viewpoint dialog box to adjust the values for both vertical and horizontal angles of view.
Click Viewpoint tab > Camera panel, and move the FOV slider to control the camera’s angle of view.
Moving the slider to the right produces a wider angle of view, and moving the slider to the left produces a narrower, or more tightly focused, angle of view.