Hello Stefan,
I'm sorry to hear that.
You could run the following command on your hub to adjusts the the minimal width to 1280px. :
sed -i 's/min-width:1385px/min-width:1280px/' /var/cfengine/httpd/htdocs/public/themes/default/bootstrap/compiled/css/cfengine.less.css
We will also change the minimal value in the sources.
If there is anything else you need help with, feel free to reply here.