To open the Freehand tool, double-click on "Freehand" in the Toolbox. While Freehand is the Current Tool, you can LMB drag in any Camera view:

freehand_sample1.gif (7627 bytes)

As soon as you release the LMB, the tool creates a polygon identical to the shape you drew:

freehand_sample2.gif (6877 bytes)

Note that the polygon that is created is exactly the same shape and aspect ratio as the shape you drew, but it is part of the plane defined by the two axes that aren’t currently Active (the XY axis in this example, since the Z axis was Active when the shape was drawn) centered at the origin. The tool will display the number of points in the polygon you create.

If you’re unsatisfied with the shape of the polygon you create, simply LMB drag the mouse again, and the polygon will be replaced by the new shape. At any time you can:

Hit the OK button to close the Freehand tool and keep the last polygon;

Hit the Cancel button to close the Freehand tool, discarding the last polygon;

Hit the Create button to make the last polygon "permanent", and reset the counter so you can continue to create freehand polygons.