Changes the view orientation of the 3D model to one of the following standard views: Iso North: Top Left, Iso North: Top Right, Iso North: Bottom Left, Iso North: Bottom Right, Look Down, Look Up, Look North, Look South, Look East, and Look West.
The 3D view must be active. Select View > 3D View > Show 
to turn on and off the 3D View, or select Show on the 3D View toolbar.
What do you want to do?