Plot > Surface Components > Surface Contours Off

Turns the contours off.

This component can be accessed via the Strength Factor Components toolbar as follows:

This toolbar can be changed to a vertical orientation by dragging is against either the right or left hand edge of the main window.

It can be changed back to a horizontal orientation by dragging is against either the top or bottom edge of the main window.

Selecting the button on the Contours toolbar activates the Surface Components toolbar.