Well. The “huge empty space” you mentioned isn’t seen for everyone, it depends on their resolution. And most people favor scrolling up and down to scrolling left and right.

But could you be a bit more clear on exactly what you are referring to? If it’s the embedded chat, you can open that in a new window and/or turn off embedded chat completely. I really can’t think of what you would be having to scroll up and down with so much though.

Oh, another possibility would be changing between fullscreen/non-fullscreen. It might fit things better in fullscreen or out of it, just depends.