Other than the Invoice Module, you can also delete invoices from the customer’s Address Book on the Customer Module, and the Estimates Module through the Invoiced Estimates. Paid invoices cannot be deleted.
From the Invoices List, find the specific invoice to be deleted. Click on the 3-dot menu and select Delete.
You can also access the Delete option by opening the invoice. Select Delete from the Actions button drop-down list.
The Deleting Confirmation window will come up. Select Yes to continue. Select No to cancel the delete action.
The invoice will be removed from the list of invoices.