You can delete a single NFT in your store using Delete NFT button. When you remove an NFT product, it’s permanently deleted from your store, and you can’t undo this action.
Note: Delete NFT option only available when there is no any Sell Order created for the NFT. 

To Delete NFT:

Step 1: From your Store Admin site, select NFT to go to NFT Listing

Step 2: Click on View Detail to view NFT details. Select Delete NFT in Action button

Step 3: A confirmation pop-up asking your permission of deleting NFT will appear. Click on Delete