Contours tab

Update Contour Lines - This option allows contour lines in the layer to be updated and changed.

Contour Smoothing - This option adds an additional smoothing to contour lines.  

Contour Labels - This option displays and hides contour line labels for all contour lines in the selected layer.

Change All Contour Lines to Normal Lines - This option changes all contour lines in the selected layer to a "Normal Line" line class.  This option will erase all the contour line's contour values.