Left Roll is available in the Creator tier and Pro tier.
Left Roll smoothly and evenly moves the layer from offscreen right to offscreen left, like side-scrolling credits. It positions the layer right of the viewer, just out of view, at the first frame of the layer, and moves it to left of the viewer, just out of view, on the final frame.
There are no controls for the Left 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.