Hi,
Disabling the "Responsive" option through template settings should do the trick. I don't know why it didn't work in your case. I will deeply investigate it. Disabling the "responsive" option through template settings remove this META viewport TAG from the website:
<meta name="viewport" content="width=device-width, initial-scale=1">
Without this META tag, the CSS media queries are ineffective.
But apparently you found a way to handle this problem though, so.. good for you.
Case solved, topic is closed.
Regards,
Support & Development