Thanks for taking the time to reach out to the QuickBooks Community.
If you don't mind my asking, what are you're trying to print in QuickBooks Online? For example, a report, list, etc.? Knowing more details about what you're trying to print will help me lead you in the right direction.
I'll be sure to keep an eye out for your reply and look forward to chatting with you soon. Please don't hesitate to let me know if you have any questions or concerns. Take care!