Use the Style Manager to apply style-level overrides that control a display representation for all objects of a particular style (for example, a device style for a junction box).
Open the drawing that contains the style to override.
Expand the category and the style type that you want to override.
Select the style, and then click the Display Properties tab in the right pane.
Under Display Representations, select the display representation where you want to apply an override, and select the corresponding box in the Style Override column.
In the Display Properties dialog box, modify the display properties.