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Recently viewed helps visitors return to products they opened earlier in the same browser. Radian builds this list from product handles stored locally on the visitor’s device; no Shopify app or metafield setup is required.
A new visitor, a private browsing session, or a browser with cleared site data has no viewing history. In those cases the section shows its empty message until product pages have been visited.
The section works well near the bottom of product, collection, and home-page templates. On a product page, the current product is saved to history but removed from the visible list so the visitor sees previously viewed items instead.
Use Empty text to explain why no products are shown yet. Keep the message short and useful, because it can appear to first-time visitors before they create a browsing history.
Theme blocks render above the product cards. Use them for the section heading and supporting copy, then arrange them in the sidebar in the order visitors should read them.
Open two or more product pages in the same browser, then return to a template containing Recently viewed. Confirm the current product is excluded, previous products appear in recent-first order, and the count respects the Products setting.
If the empty message remains, visit product pages in the same browser and avoid private browsing. If one product is missing, confirm it still loads on the Online Store. Clearing site data resets the history by design.