The ACTIVATE CONTOURSET command activates the specified contour set. If the active document has only one contour set, it is active by default. Only one contour set can be active at a time.

In the Arbortext IsoDraw CADprocess user interface (in 3D mode only) this macro command corresponds to clicking the space to the left of a contour set name in the Contour Sets window (Show attribute window > Contour Sets). After you click, a red dot appears next to the contour set name indicating that it is activated.