Customizable separator lines between List Items and "Click to switch to next product" function

Hi team.

We have our Worksheet NUX Page set up like this. (Please refer to the attachment)

What we want:

1. Separator line between products (List Items) should be customizable. So that users can clearly know which product they are focusing on, thus improving efficiency.

2. Proceed to the next product upon clicking on a button. Information in Additional Insights should also be synchronized. This helps greatly improving working efficiency.

To better understand those requests, please refer to the edited screenshot i posted.