Once the trend data is plotted, use the check boxes in the legend to hide or unhide trend values from appearing in the chart. If you want to remove the trended object from the legend and the chart, click the Remove icon (X).
To highlight a specific trend object and its data, click on its name in the legend. This action sends the selected series and its associated y-axis information to the foreground of the chart.
If you try to plot a trended attribute that was deleted or whose object is offline, its legend icon is blank and a user message box appears.