When you select a drawing tool in the conceptual design environment, the available 3D work planes are automatically detected as the cursor passes over them in the drawing area. You can click to select one of these work planes, or explicitly set one from the named references listed in the Placement Plane list on the Options Bar. If you have several tiled 3D views, and you change the active work plane in one of the views, it changes for every 3D view.
When a drawing tool is selected, the following tools become available: