The ruler for horizontal guidelines is inverted. How do I change this?

In other words, x: 0.0" is in the upper left corner, as expected, but y: 0.0" is in the lower left corner. I don't know how this happened!

How do I set the ruler so that both the 0.0" coordinate for both x and y is in the upper left hand corner (as is standard in most programs)?

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