Minamaze – boxed layout how?

Hi all

I’m using the Minamaze free theme on a multisite installation. I want to use the boxed layout. And it’s runnung on one of my sites. But on the other it’s in full screen (full width).
Where can I change that?

Here you find the two versions:
http://www.psychotherapie-nordend.de (boxed layout)
http://www.es.psychotherapie-nordend.de (non boxed)

Thx for your help!
Markus