To Use the Zoom Port
1. Click 
on the Graphics toolbar or click > Zoom Port. The Zoom Port window opens in the lower-right corner of the graphics window. The portion of the layout that appears in the graphics window is displayed in the Zoom Port in a red box.
on the Graphics toolbar or click > Zoom Port. The Zoom Port window opens in the lower-right corner of the graphics window. The portion of the layout that appears in the graphics window is displayed in the Zoom Port in a red box.2. Click 
or 
in the Zoom Port to zoom in or out of the layout. The red box adjusts to show the boundary of the current view of the layout.
or in the Zoom Port to zoom in or out of the layout. The red box adjusts to show the boundary of the current view of the layout.