Showing and Hiding Rows or Swimlane Labels
From OnePager Documentation
Row and swimlane labels appear on the left hand side of the view and provide space to title each row or swimlane:
1) To show or hide row or swimlane labels, right click anywhere in blank space on the chart.
2) For example, blank space in the above chart is anywhere you see the background color.
3) A context menu will appear, giving you the option to show or hide row or swimlane labels as shown below:
(12.2)