Pan and Zoom
To Pan
Gesture: Use a two-finger drag to pan.
Note: When no command is active, you can also use a one-finger drag to pan.
To Zoom
Gesture: Use a pinch to zoom in, or spread to zoom out.
To Zoom Extents
Tap ZOOM EXTENTS 
in the header.
Gesture: Alternatively, use a two-finger double-tap.