How change background in canvas(scroll background) by next and previous button?

Hello
How to scroll the second hall (second image) after clicking on the next button to move to the location of the first image and each of the images move to next.
I’m sorry for bad english.

I find the easiest way is to put them all in an empty gameObject and then put a horizontal or vertical layout on it and then you can either change the child order or move the gameObject. I do it in my free comic asset, check it out: Interactive Comic Maker | Game Toolkits | Unity Asset Store