2.) Select the color you would like to remove and press edit.

           

3.) Check the "In-Active" box to disable the color group

           

4.) If you need to reinstate the In-Activated color, select "In-Active" on the Edit Color Groups Screen to show all in-active colors. They will have an Exclamation mark in front of their name. You can edit the color group and disable the "in-active" checkbox.