Answer:
During the creation of a new member hinge, it is required to specify a Global Coordinate System for the hinge, for the Scissor Hinge option to be available. After selecting the function, a new tab of options becomes available where you can define exactly in which directions the scissor hinge is supposed to act.
In the example shown below, there are two substructures.
The left model shows the behavior of a system where moments are transferred in a continuous direction between two elements with a scissor hinge defined.
The right model shows the behavior of a system where only one of the elements has a scissor hinge.
