Scrollbox not going to the end

So I have a problem with the scrollbox. I want to make a level select with a map and when I put the map image it scroll only to the half of it and won’t go any further that that. So I have half of the map that can’ be seen. How to fix this. This is a school project for finals so I have to find a way. I am making a gamr like subway surfers and it os vertical. I want my map to scroll horizontaly. Can you help or give me an idea how to do it in a different way.