Open any product with geometrical data.
With the
specification tree visible, select
(or press Shift + F2).
This displays the Overview
on specifications window containing a view of a specification tree's
portion:

Point to the overview window to display the
cursor,
and drag.
This drags the overview viewport through which you
view part of the specification tree.
While dragging, the cursor changes to
:

Drag the handles located in the upper-right and
lower-left corners of the viewport.
This zooms the size of the overview viewport.
Only that part of the tree you see inside the
overview viewport is visible in the document window:
