Go to Promotions > Discounts to manage the discounts. You’ll notice that “Published” has been added to discount records which are enabled by default and a filter has also been added to filter published discounts as shown in the image below: 



To Publish / Unpublish any discount, please click on the edit button for a discount. On the discount details page, you will see the Publish / Unpublish button along with the rest of the buttons as shown in the image below:




If a discount is not published then you will see a button to Publish the discount. If a discount is already published then you will see a button to Unpublish the discount.