How about Layout for SketchUp for iPad?

Why are my autoshape dimensions set as mm rather than inches?

Why does your actual post have no relation to your thread title?

Because push pull windows on the desktop field.

My guess would be because, as a starting point, mm speaks to a larger portion of the user base. If you are having trouble with it, I would suggest pulling tape measure lines to where you would like the auto shape to reach and then using the slider to adjust it to the tape measure.