The display properties of a door determine how the door appears the drawing. They are different from door object properties, which describe real world characteristics of doors, like the direction of the door swing, or the width of the door. Display properties describe how the door objects are displayed in the drawing, like cut plane, and layer, color, linetype settings.
Display properties are often dependent on a specific view; for example, the door swing and the threshold symbol appear only in plan views.
The display properties of a door can be set on 3 different levels: