This feature is set under the Advanced Options on the Add Products page (click the dropdown to view them).
This gives you the option to hide a product from being displayed on your shop but still see it and be able to edit it yourself. This will hide the product from Google, the GroovyCart homepage and your customers.
|Restrictions:||Must be either Hidden or Visible|
|Change Via:||View Product Page (requires login) Then clicking Edit on the product you wish to edit|