Responsive grid not working on mobile

Hi Webflow Community,

I created a 4 columns grid on my Desktop version and I want to switch to a 1 column version for Mobile.

I deleted the 3 columns as indicated in the tutorial but I am stuck with the same grid (also I cannot modify the layout on the mobile version without impacting my other breakpoints). I am definitely stuck.

Here is the link

Thank you for your help!

Cyril


Here is my site Reaview_link&utm_source=designer&utm_content=kikas-sublime-project&preview=ed51f365a6a9b094681656f6d1e7929b&pageId=60489ddf3e7d7cfa2d6459ef&mode=preview
It does not workd-Only: LINK
(how to share your site Read-Only link)