Use Zoom To Rectangle 
to enlarge the view of an area of the design.
Click the Zoom To Rectangle icon 
to the right of the status bar, and the mouse pointer changes to the zoom in pointer
. Then either click a point on the design you want to zoom in towards, or click and drag a rectangle around the area you want to enlarge and release the mouse button to zoom.
Zoom To Rectangle is automatically deselected after you have used it.
Shortcuts
-
Status Bar:
-
Keys: Ctrl + 0
If you have a wheel mouse, hold the Ctrl key and move the wheel to zoom.