[scribus] Double sided layout?

[Jim Ford]

  To get the 'feel' of Scribus I decided to layout the centre pages of 
the children's illustrated book my wife has produced. Scribus is nice to 
use - much nicer for the purpose than Photoshop which I was previously 
using.

I chose 'double sided layout' with the page dimension of a single page. 
Scribus just showed the one page, with no option to continue onto the 
facing page. I added a page and completed the layout, but when the 
document came to be printed, two separate pages were printed, rather 
than the two together which is what I wanted.

I've had a trawl through the docs. and net, but can't find anything that 
helps me. What should I have done, please ?

Jim