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I find the "problem box" to be annoyingly small,I can move it but cant find the way to make it bigger?
My advice is to change the resolution to 800x600 before playing.
After toying around with game settings for a while I figured this was our only option. I'm playing on Macbook Pro with Win7 on Boot Camp, and it's hard to see this stuff at 2880x1800 Resolution. It seems the 'Playfield Sizeable' option is grayed out unless you go to 'Workshop'.

Ahh well, I can play it again. It's been ages!