Matrix wraps when screen is small.

[alexsb]

While the matrix works fine for our minimum specified setup, this should still never happen:

We always want to scroll instead of wrap.

[dwootton]

Made temporary change to disable wrap and enable horizontal scrolling; however, if the screen is shrunk before the visualization loads, the resulted visualization will now be smaller too. This will require a bit more work to fix, so I'm pushing my change so we can get heuristic evaluation out, but I'll keep this issue open while I'm working on it.