Profile: sildaviaes

Hi,
I would like to switch off responsive feature in ArtFactory shop.
I downloaded the theme a couple of weeks ago, and my nopcommerce version is 3.4.

I have seen other user asked the same for other template some months ago:
http://www.nop-templates.com/boards/topic/2040/how-to-swich-off-responsive-feature

But it seems not to work for Artfactory. I have followed all the steps except editing  styles.css, that seems not to have that lines.

For me it's very impotant to solve this. Could you please help?
Thanks in advance,
Silvia