You use the button to invoke the zoom tool, with which you can enlarge a specific area of a border. The cursor turns into a magnifying glass, which you can click and drag to define the area you want to enlarge.
Related Topics:
Zooming in and out
button to invoke the zoom tool, with
which you can enlarge a specific area of a border. The cursor turns into
a magnifying glass, which you can click and drag to define the area you
want to enlarge.