How do I turn off/on auto generation of invoice numbers?

• Open the New Invoice page.
• Go to the field called Invoice Number.
• Click the gear icon next to this field.
• Choose the option ‘I will add them manually’ and click Save to apply your preferences.
• Henceforth, you’ll be able to enter your own invoice number.

Otherwise, you can directly edit the auto-generated invoice number if it’s a one time action.