How to change category output in delta theme?  do the same as in Gamma?  replace the carousel with a tile in the mobile version.

Delta

@Ivan
In responsive.css, try to remove/comment these lines:
  .cat-picker .cat-tab.root .cat-in {height: 88px; overflow-y:hidden;overflow-x: auto; white-space: nowrap;scrollbar-width:thin;scrollbar-color: #9e9e9e rgba(0,0,0,0.05);}
  .cat-picker .cat-tab.root .cat-in::-webkit-scrollbar {box-shadow: none;height: 5px;background:rgba(0,0,0,0.05);}
  .cat-picker .cat-tab.root .cat-in::-webkit-scrollbar-thumb {border-radius:100px;background-color: rgba(0,0,0,0.3);background-clip: initial;box-shadow: none;}
  .cat-picker .cat-tab.root .cat-in::-webkit-scrollbar-thumb:hover {background-color: rgba(0,0,0,0.6);}
  .cat-picker .cat-tab.root .elem {border:none;border-right:1px solid #ccc;margin:0;float:none;display:inline-block;width:100px;padding: 6px 4px 8px 4px;height:88px;}
  .cat-picker .cat-tab.root .elem strong {height:28px;font-size:12px;line-height:14px;}
  #category-picker .shower .wrapper {margin:0;height:calc(100% - 90px);margin:0;}

Thanks!