Hello,
Thanks for the screenshots.
1) Set 100% here – https://prnt.sc/12r2pz6
2) The current layout of columns can’t be displayed like the gallery on mobile.
You can use our Product Categories element – http://prntscr.com/12r2tuz , select Display type
> Slider, and set Slider Items per view. You can even do not delete current content, but add new element and Show it on Mobile only using Responsive settings – http://prntscr.com/12r2xwe
Regards