Use this editor if you wish to create/edit an achromatic mark that is saved as a resource in "Marks". For that reason, only register marks, plate control marks, scavenger marks and Klebrand code marks display as a "mark type". Use the editor for color control bars (Color Control Bar Editor ) or ink pickup bars (Ink Pickup Bar Editor ) if you wish to create color marks.
See also the description in the "Editors for Marks, Color Control Bars and Ink Pickup Bars" section:
•Loading the 'Marks' Resource to the Job