This type of element includes any solid geometry in the Family Editor or extruded roofs in a project.
Click Modify | <Element> tabWork Plane panel (Edit Work Plane).
The Work Plane dialog displays, and the work plane grid for the element displays in the view.
TipYou can also dissociate an element graphically by clicking (Disassociate Work Plane), which displays near the element when you select it in the view.
When an element is no longer associated with a work plane, the value of its Work Plane parameter (on the Properties palette) is <not associated>. The element is free to move irrespective of a work plane.