Display panel > Link Display rollout
The Link Display rollout provides controls that alter the display of hierarchical linkages.
Display Links—Displays a wireframe representation of any hierarchical links affecting the selected object.
Note: Display Links must be turned on in order to see Joint Limits on a inverse kinematics chain.
Link Replaces Object—Replaces the selected object with the wireframe representation of the hierarchical link. This option offers another way to reduce the geometric complexity of selected objects in a scene. See also Display Properties rollout.
The Draw Links As Lines option on the Viewports panel of the Preference Settings dialog further reduces the display of links to a single line.