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Declutter Blackboard UI
See here for details: https://explain.mit.edu/class/mDbUrvjy4pe8Q5s5wyoD/posts/2CVk5xVBQz8YCUWdRjqY
Without the change, the UI is cluttered and unintuitive, and even I myself was confused as to why I couldn't draw on my Surface (it's because the enable touch button is hard to see).
With the change, the UI is clean, refreshing and easy to use.