AutoCAD Mechanical toolset includes a set of commands that enable you to toggle the visibility of mechanical layers assigned to specific objects.
These objects are:
Because the automatic property management mechanism ensures that the program draws all mechanical objects on the preassigned layer, you can toggle the visibility of these objects by turning the appropriate layer on or off. Because turning these layers on or off is achieved through a set of commands, you do not have to remember the layer to which these objects are assigned.