You can change the view direction either from toolbar or context menu. You
may look from top , right , front etc. And you can pan , rotate or zoom to an
area by dragging mouse on the graphic screen after giving the command
from toolbar .
You can zoom in-out to the cursor location by rolling the mouse wheels.
You may rotate the view dynamically by dragging on the screen while mid
mouse button is down.
If you activate pan the view state by pressing related toolbar button , you
may pan by dragging while left mouse button is down.
You can also zoom to a box by dragging with left mouse button down after
related toolbar is clicked.
Click here and here for more information about basic viewing functionalities