Make the columns adjustable to avoid horisontal scrolling. To make it possible to view the left and right colum at the same time. You could also make it possible to hide columns not needed. Current solution makes misstakes easy since it is hard to know wich file you work on.
I have got a big screen, now showing "lots of nothing" and at the same time hiding part of the data I want to see (left and right column)
It is important not to fill the screen more than 100%