You can add the custom collection image in the Hero theme, which also supports configuring and customizing the collection image of each collection and the height for the Desktop and mobile separately. At the same time, you can optimize the layout of the product list, and added a layout option.
1. Start here: SHOPLAZZA admin > Store > Themes > Customize > Collections > Collection header > Add custom collection image
2. Set up the custom collection image as you needed.
3. Set up the product display layout via Collection > Collection pages.
4. Set up the Default product layout and Products per row.
5. Click Save Draft or Publish to complete the setup.