Trouble with panes in Big Bento..

[Def_Dynamo]

I was using 3 panes (sort of like this: http://images.4chan.org/g/src/1312515840580.jpg) and decided to mess around with the layout a bit. I ended up getting it like this: http://images.4chan.org/g/src/1312514608403.png, but now I don't know how to change it back. The buttons used for changing it were to the left of the search bar, but now they are gone..

Help?