My name is Sunny from the Shopify Guru team and I would be happy to help with this!
To make sure I understand your request correctly, are you able to share an example of what you are looking to achieve? Perhaps a link to an online store that has this set up already or if you can share your own shop with me and explain in more detail where and how you would like it laid out, that would be very helpful to make sure we are on the same page.
When it comes to adjusting the collection layout from grid to list, that would depend on what theme you are using but normally, you would need to choose one or the other, not both. With that being said, some themes will have both grid and list options so you can decide which you prefer! What theme are you using? I'd be happy to check if that is a native feature for your current theme or not, and then lay out your best options moving forward.
Please let me know if you have any questions at all and I look forward to hearing from you!
Sunny | Shopify Guru