Graph Legend
Right-click a graph in the Data View and select Visible Items»Legend to open the graph legend. The graph legend lists every signal displayed in the graph and the corresponding plot color. To remove a signal from the graph, remove the checkmark from the checkbox next to the signal name. Click the plot color next to a signal to change the color of the signal.
The order in which the graph legend lists signals is the plot order of the graph. You can use the Signal Order page of the Display Properties dialog box to change the plot order of a graph.