I appreciate you joining in the thread, @MD GO GREEN.
This isn't the kind of service I want you to experience. If you're printing checks on a blank check stock, you will need to have a third-party solution that can be integrated into QuickBooks Online.
At this time, QBO does not directly support printing checks on blank check stock.
You can refer to this article for more information: Print checks on blank check stock.
I'm just a post away if you need anything else. Have a good one.