big images in Top Menu

Hello support,

on your demo site (http://demo.designwall.com/#dw-focus), I can see big rectangle images in top menu.

In the documentation (http://www.designwall.com/guide/dw-focus/#menus-configuration) and on my web site (http://infodiagnostiqueur.com/), I see small square images in top menu.

How can I have these big rectangle images in my top menu ?

Thx,

Guillaume