How to change a Shopify template using URL

Adding this query string parameter will allow you to test a theme template on a page or product on a live site, without your customers seeing it.

?view=template-slug

If you already have a question mark in the URL, maybe for a variantId, then use an ampersand instead.

Where to find the “template-slug”

In your theme customiser at the top of the page, you can find the templates for different page types.