I recognize the convenience of marking an invoice to print later, T and T.
As of now, the option is no longer available in the new invoice layout. I can see how this functionality would be beneficial to your business. I encourage sending a feature request directly to our Product Development team. Doing so helps us improve the features of the program. I'll show you how:
Go to the Gear menu and then select Feedback.
Type in your feature request in the description box.
Once done, click on Next.
You can get back on this thread to stay informed if there are any updates regarding the availability of the option. If you have any other questions about the program's features, please don't hesitate to keep us posted.