Use the RollViewVertical command to tilt the view of your model vertically about an imaginary horizontal axis.
To view the model in 3D using Vertical Orbit:
A pivot point appears in the center of the model. If you selected entities before you entered Constrained Orbit mode, the pivot point appears at the center of the selected entities.
Note: The arcball feature is not available in this Constrained Orbit mode.
Access
Command: RollViewVertical
Menu: View > 3D Orbit > Vertical Orbit
Ribbon: View > Render > Vertical Orbit
Toolbar: Vertical Orbit