The BiFold door is hinged in the middle as well as on the side. It has two door elements. You can also make the door a double door, with four door elements.
Single and double bifold doors
This topic describes only controls and behavior unique to the BiFold door. Most door parameters are common to all kinds of doors; see Doors.
For using materials with doors, see Doors and Materials.
The Parameters rollout contains three checkboxes specific to BiFold doors.
Makes the door a double door, with four door elements, meeting in the center.
Makes the door swing in the opposite direction from the default.
Makes the door hinged on the opposite side from the default. Flip Hinge is unavailable when Double Doors is on.