Is it possible to go left to right using the "Activity Diagram (beta)" syntax? This would be for swim lanes too. I tried left to right direction and my docker container version would not play ball.
Version PlantUML Server 20190520-1816 / version 1201905 - the latest docker container
@startumlleft to right directionstart:Hello world;:This is defined onseveral **lines**;end@enduml