A PivotDoor is hinged on one side only. You can also make the door a double door, with two door elements that are each hinged on their outer side.
The topic for each kind of door describes its unique controls and behavior. Most door parameters are common to all kinds of doors,see Doors
In the door's Parameters rollout, the three check box controls below the Frame area are specific to PivotDoors.
Double Door: Check this to make a double door.
Flip Swing: Check this change the direction that door swings.
Flip Hinge: Check this to place the door hinges on the opposite side of the door..
This check box is disabled while Double Door is turned on
For an explanation of how to create a door see Doors