To remove a work from the sale on the site, you have three possibilities.
1.Delete the work.
To do this, select the work's file and then click on "Delete".
2. Mark as Sold out
The work will then bear the sticker "Sold Out" instead of the price and users will no longer be able to buy it.
To do this, click on "Mark as sold out" or change the number of copies available to '0'.
3. Deactivate the work.
This will allow you not to show the work online, but to keep in in your account in the "inactive" tab of your artworks.
Click on the button on the thumbnail of the work.