Select the Zoom tool
from the Orient ribbon group or status bar.
Click where you want to center the zoom.
Drag down to zoom into your design; drag up to zoom out.You can also
use the scroll wheel to zoom in and out.
Note: When working in any tool, Ctrl+click the middle mouse button, then drag up and
down to zoom. You can also press Ctrl+ or Ctrl- to zoom in or out
a preset amount.