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:
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Select the node and then select Expand Node from the Map Console Map menu
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Right-click the node and then select Expand Node from the pop-up menu.
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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.