Right Roll smoothly and evenly moves the layer from offscreen left to offscreen right, like side-scrolling credits. It positions the layer left of the viewer, just out of view, at the first frame of the layer, and moves it to right of the viewer, just out of view, on the final frame.
There are no controls for the Right Roll behavior. The speed of the animation is determined by the size and duration of the layer. To speed up the movement, shorten the layer duration. To slow down the movement, extend the layer duration.