How to delete an actor
oh, so you need to delete it from pool. Go to pool of that swim lane -> Actor -> select the actor you want to delete and click on delete.
I'm afraid you didn't understand my question. I was asking about how to delete an "actor", not a "user". Within the studio, when you add a new actor to a swimlane, there is no way that I can see to delete this actor.
Even if there are no users mapped to the actor, and no tasks assigned to the actor, it seems it is impossible to delete.