A Transition Indicates the shift from one scene to another; in a Spec Script usually isn't necessary since a cut to a new scene is implied by the next Scene Heading.
With the cursor at the beginning of any blank element, type any word followed by "to:" and Screenwriter automatically formats and spaces it correctly (ALL CAPS and flush right).
A new Scene Heading element is created, and a Pop-up List of Initial Scene Heading Text displays.
You can also press ENTER in a blank Action element and type “t” for Make this a Transition