To correct this, you’ll need to switch over to Classic invoicing. To do this, click on the Sales item in your menu. At the top of the page, you’ll see a toggle.
Next, in the Credit Notes column, you’ll see your 2 credit notes. Click on these to go to the details. Next to the credit note that’s in draft, click on the Options button. You should see a menu open up an at the bottom is an option to delete.
All the best,