How to bring box plot box to the middle and make it wider

So I have about 25 cells of data which I am trying to create into a box plot. Problem is that the box in the plot area is small in width and sticking close to the vertical axis. i want the box to be wide and in the middle. i tried changing the gap width but it did come close to middle but became thinner. Got a school project to make 3 of these. Thanks