Hello, @acctg2.
While you can temporarily save the invoices if you're not ready to send them to your customers by selecting Save and leave or Save and close, the option to auto-save the invoices is currently unavailable.
Thus, I encourage you to send feedback so our product engineer team can consider adding this feature in a future update. Here's how:
- Go to the Gear icon in the upper right and choose Feedback under Profile.
- Type a brief description of your suggestion in the text box.
- Click Next to submit.

Let us know if you have further questions, and we'll be right here to help you anytime.