Click the More button on the top right corner of the page.
Click Delete to confirm.
If you have recorded a payment for the invoice, you will get the Show Payment History option while deleting the invoice.
In this case, you would first need to delete the Payments Made before deleting the invoice. Here’s how:
Select the Payments Made tab after you have selected any invoice.
Click the Trash icon next to the Payment made.
Click OK to confirm.
Now you will be able to delete the corresponding invoice.