How do I increase the widths of grids in both the home page and collection pages (debut theme)?

[SneakerSafe]

How do I increase the widths of grids in both the home page and collection pages (debut theme)? my website is sneakersafeuk.com, in the 1st image I have highlighted the layout in red. This layout is the same on my home page for 'featured collection' and collection pages. How do I increase the width of the grid so that it looks like the 2nd image? I want the grid to span across the screen

[SneakerSafe]

bump

[KetanKumar]

@SneakerSafe 

Sorry for facing this issue, it's my pleasure to help us.

Welcome to the Shopify community!
and Thanks for your Good question.

Please share your site URL,
So I will check and provide a solution here.

[SneakerSafe]

I wrote it in the question. its sneakersafeuk.com

[KetanKumar]

@SneakerSafe 

do you mean like this?

[SneakerSafe]

Thats right, but with less gaps in between the products. So basically increase the size of the thumbnails if possible

[SneakerSafe]

Like this

[SneakerSafe]

the areas I highlighted in red are the photos (not including product titles). tried to draw them as squares lol

[SneakerSafe]

bump

[SneakerSafe]

@KetanKumar