A friend, is creating an 8 page document but the pages are in the wrong order. (eg a spread is 3-2). He has recently been doing some work in Arabic and he wonders if that has changed the settings. How does he reset the page numbering?
The binding side is set to the right side, as for an Arabic or Hebrew book.
To change it back: File > Document Setup, and click on the little icon
there to set the binding side to be on the left as for an English book.