Modify a Transformer Rig by using Query edit on any one of the target geometries.
After you have created a Transformer Rig and exited the Transformer Rig toolbox, you can still return to the toolbox and make modifications.
The Transformer Rig toolbox plus all the color highlights reappear to show that you have returned to the Transformer Rig toolbox.
The corresponding yellow-green highlight is removed, and the surface returns to its pre-transformer rig shape.
The shape of the surface will follow the modifier surface, and yellow-green highlights appear on the surface.