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TBH? I think maybe the best way to go about it would be a sort of "dummy" product that acts as a folder. With its own name and header image. Clicking it would take you inside

I think I will try the column idea for now. Do you know if it extends to smaller format screens? I imagine it doesn't.

(+1)

Good point. I'm afraid it all reverts to being one column on small screens. But another recommended solution is to put your own products into collections that you showcase below the main area. That can fit rather more of them, but there's still a limit and doesn't look as good. Also, most of us use collections to showcase games by other people, so that can be a source of confusion. See how it works for you.