You can easily void an invoice in Moon Invoice by following the steps below.

1. Open the Moon Invoice application on your device or tap on this link.
2. From the Dashboard, navigate to Sales ➜ Invoices.
3. Click the ‘+’ icon to create a new purchase order or select an existing one.
4. On the right-hand side, click the three-dot icon (⋮) and choose Mark as Void.
5. Once clicked, the invoice will be marked as Void.