If this is what your category's "Organize Products" screen looks like, you may have added products to the category that will not appear for your customers.
There are several reasons why a product may be flagged as "NOT VISIBLE":
- The product is Disabled
- The product is set to Visibility = "Not Visible Individually", or "Search"
To fix this issue you can either remove the product from the category, or edit the product to make it visible.
Updated about 1 month ago