Hello, food7574.
I know a method to show the word " VOID" on the invoice.
QuickBooks Desktop has a variety of templates to choose from when it comes to invoicing customers. You'll be able to change the current template you're using to have the word "VOID" appear on your invoice. I'll show you how to do it.
- Open the voided invoice.
- From the invoice screen, click the Formatting tab.
- Choose Manage Templates.

- In the Manage Templates window, select any of the following templates (Copy of Intuit Product Invoice, Custom S.O. Invoice, Intuit Product Invoice, Intuit Professional Invoice, Intuit Service Invoice, and Progress Invoice) from the Select Template section.

- Hit OK, then OK.
For your reference, I've added this article on how to delete or void transactions in QuickBooks Desktop: Batch delete or void transactions in QuickBooks Desktop Accountant Edition.
Additionally, you can review this resource to learn how to check if an invoice has been opened and read: Verify that an invoice was emailed and read by the recipient.
Keep me posted in the comments if you need further assistance managing your invoice or sales forms. I'll be here to lend a hand.