Welcome to the Community, @HemLaw16.

Let me provide some ideas about customizing check stubs in QuickBooks Online (QBO).

The option to customize the check stubs is unavailable in QBO. The account number will be present to all check stub pages. 

Meanwhile, I recommend visiting our QuickBooks blog to stay current with the news and product updates. You can check out this site from time to time through this link: https://quickbooks.intuit.com/blog/.

You'll want to know how to print check stubs in QBO. Please browse this article for the steps on how: How to print check stubs.

I'm always around to lend a hand if you need more help with managing your check stubs or any QuickBooks-related concerns. Take care and stay healthy.