By default, expanding a node marked with plus sign adds all nodes (and their edges) that are one hop away from the node.
You can use any of the following methods to expand a node marked with plus sign:
Select the node and then select Expand Node from the Map Console Map menu
Right-click the node and then select Expand Node from the pop-up menu.
Select the node and click the “Show neighboring nodes” button.Note:
Double-clicking a node launches either a Notification Properties dialog box or a Topology Browser view for the object, depending on whether any notifications are associated with the object.