It is near the top, should be "Screen Resolution".It is a drop down box, you click it and it gives more options.You want the ones with (Windowed) in the name or such.
AH! Thank you kitty! (Offers fresh tuna and catnip-flavored white chocolate mousie with red and green holdiay sprinkles.)
How can I change graphics from Full-Screen to Windowed mode? I was looking for a checkbox in the Options and can't see it.