This is currently what all of the product collection pages on my site look like:
With the actual products only taking up about 1/3 of the screen. (I am using the Supply theme and my website is here)
But I would like it to look more like this (an example from another Shopify website):
Where the products take up almost all of the screen. I'm not sure how to achieve this on my own, if it's a matter of a different theme, or if it's a code thing.