You can search for nodes in the diagrams. Node search terms are regular expressions, so sub will match any node containing "sub", while ^sub$ will match only "sub" nodes. You can also search for paths in the diagram, by specifying a (top down) sequence of nodes, separated by spaces. A * can be used within a sequence as a wildcard. If there is more than one path, you can highlight them successively by using the left and right arrows.