In the Catalog Layout for customers section, you (Seller Admin) can add products in the Catalog.
NOTE! If the product is not added to any of the categories, it will not be available for the customers.
1. Select "Catalog"→ Layout for customers.
2. Select Customer Segment.
3. By drag & drop option you can sort the products into categories.
Note! Products having prohibition sign will not appear in the Product Catalog, as it is "Not available in your country or for your industry". In more detail read the article "Product unavailable“ badge description.