Open any product with geometrical data.
With geometry visible in the
geometry area, select .
The geometry is displayed in the Overview on
geometry window, but not the specification tree:

Point to the overview window to display the
cursor,
and drag.
This drags the overview viewport through which you
view the geometry. Only that part of the geometry you see inside
the overview viewport is visible in the document window:

Drag the handles located in the upper-right and lower-left corners of the
viewport to zoom the size of the overview viewport.
While you drag, the cursor changes to:
.
This lets you zoom the geometry in and out in the document window:
