In this view, you introduce all elements of your scene defining has many types has required by cloning them.
In this view, you position elements and involve them in pathways. You also note that the legend is free of types for which no elements get introduced.
This is the show time view for elements and other components of your scene. Here we took out everything that is not helpful for presentation. So there is no layout or way to introduce new elements but you can still describe them!