Draw Part Reference BoxesKeyCreator \ Edit \ System-Settings \ Draw-Part-Reference-Boxes
Location: Edit>System Settings>Draw Part Reference Boxes
This function allows the bounding boxes that are displayed by suppressed and hidden part references to be viewable or temporarily hidden. Turning this off will remove the boxes from display.
NOTE: This setting is remembered only for the duration of the session, and defaults to ON each time the Viewer is loaded. To remove the boxes from display more permanently, turn off the display of levels that contain the part references.