For all sales channels the process is the same. In order to unpublish a product from your store, simply visit the “My Store” section in Printify and choose the product you wish to unpublish. Click on the ellipsis icon and hide it:
Once these steps are done, you will see a “Hidden in store” icon before the product title. The "See in store" button won't be visible either. To republish the product, just repeat the process but instead “Show on [store]” will appear.