I originally created several swimlanes and started the workflow but need to re-arrange the order to cut out the number of connectors crossing over each other.
I've found it's possible to reposition a swimlane this way:
- click on the swimlane you want to move, in order to select it
- click and start dragging it...
- press the ALT key and drop the swimlane over the one in the position you want to take.
The dragged swimlane will be inserted before the existing one.