Motion > Positioning Modes >Lateral
Moves through the model in any direction using any combination of mouse drag and directional modes. You can define the current eye point location using the Position Control toolbar, the View > Settings > View Cone tab, or the View > Place > Eye Point Only command.
Click Motion > Positioning Modes > Lateral.
You can also select Lateral on the View Menu.
Set or adjust the center point.
Adjust the eye point (the blue track in the Plan and Elevation views).
Select a motion type from the Motion > Move menu.
To switch between encircle motion settings without losing your clipping plane settings, use the Home key on your keyboard to cycle through the four Positioning modes. The End key cycles through the four Directional modes.