On the Highlight Menu, click Function Code Hotspots.
Check this option to enable the link from the function code number (or AI/DI import block) to the function code index. If Function Code Hotspots is enabled, clicking on a function code number in the content pane will cause the index of all the uses of that function code to be displayed in the index pane. If it is disabled, clicking on a function code number will have no result.
Note: This option, despite its name, does not cause function code hotspots to become highlighted. It causes them to become enabled. If Function Code Hotspots in the Highlight menu is not enabled, clicking on function code hotspots has no effect.