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How do I change the width of the screen? And what is the hard-coded width? Seems to be a fixed width, which isn't even as wide as my 1024x768 screen display... Need flexibility with this I think, for larger displays, requirements...
There is a drop down where you can select a predefined screen size:
Or if you click Custom Size, you can enter the size manually. Let me know if this helps.
Ok, got it. I have now found the dropdown menu 
As a user, I was expecting single click to open the Screen Properties / COMMON menu - and - actually didn't even try doubleclicking 
I did expect and assume these properties had to be somewhere... so that is awesome they are right there!
Might want to investigate that interaction and make that as a single click or even make those menus a nifty accordian, expanding based on single click...
Great stuff, I am coming over from Protoshare and iRise primarily and fascinated by what you are doing here... I also religiously use Balsamiq, which keeps me from doing layered wireframes in Photoshop etc.
keep up the innovative work! the ui and web based saas approach is wicked fast and smooth! perfect!
Disregard, there must of been something going on, as now the menus are working with single clicks...
Somehow I was able to create a scenario where no matter how many times I clicked I couldn't get anything to show up in the Common Menu...
But, trying to recreate and can't seem to get it to do it again 
or I mean
Glad it's working and thank you very much for your feedback!