Margins for A4 sheet

[Dumitru Ursu <dima ceata org>]

Hello,

I'm having some problems seeing/setting the margins for a A4 page; I've 
set up from preferences to color the A4 area with a light blue, but the 
whole canvas is painted;
When I export to PDF I get a document of 4 pages, when I really need 
just one.
Also, how do I scale the diagrams?

Dima.

Attachment: class.dia
Description: application/dia-diagram