The display control operates according to the following hierarchy:
If no object-level display control overrides are in effect, control then passes to that object’s style-level definition. If no style-level overrides are in effect, control then passes to that object’s system definition. If no system definition settings are in effect, control then passes to the drawing default level.
You can apply multiple overrides to an object, essentially layering them on the object. As you remove the layers of overrides, the highest override in the hierarchy takes control.
Display properties are synchronized across other AutoCAD MEP 2023 toolset objects within a domain. For example, if you change the display properties for duct segments whose display is controlled by Drawing Default, the display properties are also changed for duct, duct fittings, duct custom fittings, and duct flex.
Ideally you should use the Display tab on the Properties palette to make direct changes to the display properties for an object in a drawing. However, you can also use the Style Manager or Display Manager to manage all (unfiltered) display properties for an object whose display is controlled by Drawing Default or System Definition.
When a display override is added to or removed from a system, display properties are also synchronized within a domain. Display properties are synchronized for the following domains/objects: