Following Steve's correct answer when in swimlane mode you open the settings from the gear icon
Click at the beginning of the Metrics line (Search) to display the fields and tick the ones you want to pick.
To display the total you have to have a field select by which the items are put on the swimlanes.
Now you can see the summaries for each swimlane. Total Roadmapa summareis ore not in 15.4.1.
In the same manner open the settings in Grid view
and pick your targets from the list after you have clicked the beginning of the Targets (Search) line
Must admit that it took me a while even though I have watched the Jazz preview and several times the Roadmaps webinar .