Model navigation and view controls are located in the lower, right corner of the model view window. Your mouse buttons also can be used to quickly look around the model.
Zoom tools are can be used to control the magnification of the window. The perspective tool allows you to set the amount of perspective in the view.
Click the dipslay cube shows some preset orientations. The invert tool rotates the view to the view from the opposite direction. Click-and-hold any of the cube axes to rotate the model about that axis.