Hello,
Related Products is a section on some templates that pulls products from your store that share the same tags or categories as the current product.
These products cannot be specified in the admin but can be influenced by grouping similar products in the same category or by using the same tags.
Please read about related products here: https://woocommerce.com/document/related-products-up-sells-and-cross-sells/
Navigate to Theme Settings > Single Product > Related & Upsells > enable the option Show Related Products.
If you are using a custom layout for a single product page, you can edit the product grid or carousel widget at the bottom of the layout and see the data source “Related Product”.
Here is a screenshot for clarification: https://snipboard.io/xc8l0s.jpg
Best Regards,
.
