My site is no longer responsive

Hello,

Since I use this plugin, my site is no longer responsive, it no longer uses the full width on mobile: https://community.betterstudio.com/wp-content/uploads/2020/05/Screenshot_20200518-163411.jpg

According to the support of my theme, it would be due to this code : https://i.imgur.com/Z54RXze.jpg

I uninstalled the plugin, it didn’t solve the problem. Could you help me ?

Thx ! ??

The page I need help with: [log in to see the link]