Right clicking on the Workplanes entry in the CopyCAD Explorer displays the Workplanes menu.

Workplanes - this is the name of this menu.
Create Workplane - creates a new co-ordinate system. The Workplane dialog box controls the location and orientation of the new workplane. For more details see Workplanes.
Deactivate - deactivates the currently active workplane.
Draw All - displays all workplanes on the screen
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Undraw All - hides all workplanes on the screen
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Delete All - deletes all the workplanes.