I can share some details about printing receipts within the program,

It's possible to use any printer as long as it's connected to your device to access QuickBooks Online (QBO). Once you've found and opened the transaction or receipt you created, you can select either the Print or Preview button and then click on Print. Just make sure to choose your printer device (thermal printer) to get going.

When printing receipts in QBO, it is essential to ensure that you have selected the correct thermal printer device. The recommended paper size for printing receipts in QBO is Letter (8.5 x 11 inches).

Alternatively, you can search for third-party software compatible with QBO that allows you to print using thermal printers. This way, you can print the receipts to the desired size.

If you want to personalize the data of your sales forms, refer to this link: Customise invoices, estimates, and sales receipts.

I'll get back to you if you have other printing-related inquiries. Hit the Reply button below. I'm available 24/7 to assist you.

Looking to do the same for my QB desktop pro 2019

Hi, I would like to do the same for my desktop pro 2019. Any suggestions 

Thanks for joining the thread, @RM15.

I see you've shared your concern about thermal printer recommendations for QuickBooks Desktop (QBDT) twice in this forum. My colleague has already provided some helpful information on this topic. You can find it by following this link: https://quickbooks.intuit.com/learn-support/en-us/other-questions/re-compatible-label-printer-pro-20...

If you have any further questions or need more assistance, please don’t hesitate to reply to this thread. Take care and have a wonderful day!