Hi @aprilyuen ,
Means you want to add 2 options, 1 display the content as it is (in the middle and full ), 1 display the content to the left like your description?
Because if you add a new box, it will overwrite the current content, or do you want to move the current content to the left as described.
Please explain more about it, I will help you to come up with the best solution.