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In displaying a primitive shape in CF2 as well as CF3,
it seems the default canvas size in CF3 is twice the size
of the traditional total screen filling CF2 canvas size.
Does this serve a purpose or is unintentially ?

This sounds like the dynamic border that CF2 and CF3 wrap around your design if you don't have sizing or tiling enabled. You can change this in the Preferences pane or you can explicitly set it in a design: or