Select the nest level for the trace search. The default is one layer deep to isolate the immediate neighbors of the tasks based on the nest level and the trace direction settings.
Click the options for the tasks you wish to include in the selection based on their status. The default is to exclude the completed tasks and hide anything that is not in the result set. If you click "Keep Visible Tasks", then the results of the isolate command will be added to the visible tasks.
Click Apply to isolate the trace results and keep the trace dialog open. Click the Apply | Close button to close the dialog after performing the trace command.