I have designed my document with double-page spreads, why is it showing as single pages?

If your document looks like this in Designer...

But this when you view it (i.e.. in single pages)...

It's likely to be caused by the Style applied to your document.

• If you are using a shared Style make sure you select a 'Book' Style (displays in double-page spread mode) not 'Presentation' (displays in single-page spread mode). 
• If you have created your own Style, make sure 'Double Pages' is selected for 'Desktop Default Layout'.