How do I add a Sort by Tags on Homepage Collections? I have it on collections page, but not homepage

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I'd like my homepage products to be sortable by tags. Namely just one tag. I have this working exactly as I want on my current collections pages, but I can't get the sort option to appear on the homepage. I have two collections featured on the homepage and would like them both sortable by this one tag. (It's a size tag, Medium or Wide)


i'm using the Debut theme. Thanks!