Where to find it
Settings > Returns > Shop Now, under Collections.
[Screenshot: Shop Now tab — collection search and ordered collection list]
What this is
The Shopify collections customers can shop from during Shop Now.
Use the search field to find and add a collection
Drag the handle to reorder
Click Remove to take one out
Order matters: the top four products in your first collection appear directly on the return resolution page, before the customer has browsed anything.
What the customer sees
On the resolution page, the first collection's top four products appear as suggestions alongside the Shop Now option. If the customer continues, they browse the full set of collections in the order you've arranged.
[Screenshot: Shop Now Collections]
If no collections are added, Shop Now will not appear to the customer, even if the setting is turned on.
Considerations
Price points. If the first collection's products are priced well above a typical return value, customers see items they can't cover with their credit. Leading with products at or below your average return value keeps Shop Now viable.
Breadth vs. margin. A bestsellers or new-arrivals collection first gives the widest appeal; a high-margin collection optimizes value per conversion.
Category. Customers returning an item for fit may not want more of the same category first.
Automated collections stay current without manual list maintenance.
Count. Three to six collections covering distinct parts of your catalog is a workable range — enough to find something, few enough to browse.