I know how to do scrolling credits, but I prefer showing one at a time, left to right, with the same background.
i.e. Music Credit, Tess of the D’Urbervilles, George Tingley.
I created three 9 sec duplicate backgrounds, paste and copy attributes of each slide.
How do I go seamlessly from one slide to the other, so it appears like one slide?

Problem solved! Changed the Visibility.