In Optix, you can void all types of invoices in your dashboard. Simply locate the invoice in question from the Invoices page or from a specific user, and click into it to make changes.

Once in the invoice, locate the three dot menu in the top right corner, and select it. From the drop down menu, select Void invoice.

If a 'Paid' invoice includes any transactions, refunds, or added credits, you will not be able to void the invoice without first removing these line items from the invoice.