New Invoices in Draft mode - Setting -> Invoice -> Invoice Preferences -> General Settings -> Enable the option "New Invoices in Draft mode" can be used to generate invoices in Draft mode to easily identify which invoices have been reviewed. The invoice PDF will show a "DRAFT INVOICE" caption on its face. To change an invoice from draft mode to final (or vice versa), under the Unpaid Invoices section on the Dashboard, click on the "Is Final" checkbox for a particular invoice. The same checkbox is also available under Clients -> Invoices and Cases (Projects) -> Invoices tab.