Use the options on the View > Zoom > Continuous Pan menu to pan the view displayed in the Face window.
It is most effective to use the shortcut keys associated with these menu options to quickly pan the current view:
For Continuous Pan Up, use Ctrl + 
.
For Continuous Pan Down, use Ctrl + 
.
For Continuous Pan Left, use Ctrl + 
.
For Continuous Pan Right, use Ctrl + 
.