The links dialog lets you control routing arrows in large or complex simulations.
The dialog can be accessed through the Data & Rules tab.
To show the links into and out of any object click on the name of that object in the central “Object:” box.
To add (or remove) any of the selected object's routing arrows drag them from (to) the “Others:” box.
To hide the arrows exiting an object from the simulation window uncheck the “Display out links” check box when the particular object is highlighted in the “Objects:” box. This does not effect the routing of the simulation - it only hides the arrow from the display. (This is beneficial in the case of an object that has a large number of connections). Similarly, to hide the arrows entering an object uncheck the “Display in Links” check box.