Coding Pre-existing Assets or Making a New One

Hello,

I really like this feature for my website but it only showcases 30 items and each of my pages has more than 30 items. I was trying to find the backend code for the feature so I can modify it but the newest version of Squarespace wouldn't let me. When I tried to write my own code for this counsel feature, it wouldn't let me for some reason. I'm hoping someone in the community could guide me on how to do this or create a custom feature. I would really appreciate it. 

Ideally: I would like this feature to be limitless as I add items to the page but not required. If the feature could be swipe scroll compatible, that would be amazing too.

I attached some screenshots for an illustration on what it looks like now.

I don't know code this, but you can add multi summaries to show all items