Dawn theme filter by tag

Shopify Partner
59 0 18

I've been playing around with Dawn theme and am so confused because it doesn't seem to have any built in way to sort a collection by tag...the filter on the collection page only has the options of sorting by product type, price, vendor, and availability. Every Shopify theme I've ever worked with has the ability to sort products by tag built into it somewhere and this is a feature I need on every site I am working on. Do I have to figure out how to code this in myself? Or am I just missing something? Thanks in advance!