Collection List in Flowbase Template

Hi there
New user here, no code or design background.

I started a site with a CMS, collection list.
Now, I am trying to incorporate the collection list items into a Flowbase component (which looks like a grid). And I can’t manage to add the “items” inside the “Collection”.
When I add the collection list component, I can’t seem to “fit” it (the elements of it) inside that grid template.
Any idea?

Here is my public share link: LINK
(how to access public share link)