Edit design of CMS Collection 'Products' pages

I have been asked by a friend to help with his website (i.e fix issues etc) and the biggest issue is the design/layout of the product pages (CMS collection>products) (Not ecommerce).
I can’t see any way to adjust the layout and i have the feeling its probably a template you choose prior to filling in all the fields (not used webflow prior and didn’t do the initial design so no idea how it was created)
If someone could confirm if there is a way (and how) or guide to a guide ( :slight_smile: ) would be great.
Many thanks

Here is my site Read-Only: LINK
(how to share your site Read-Only link)