How do I adjust the address alignment on preprinted checks for bill pay so that it aligns with the windows on my envelopes?

Hello there, @econnolly.

Adjusting the address alignment on preprinted checks for bill pay is currently unavailable in QuickBooks Online (QBO). I can see how this feature would be beneficial to you and other businesses. 

While we continue to make your experience with us even better, in the meantime, I encourage you to star our blog to keep up with any product updates or improvements on the online version:  QuickBooks Online Blog.

To learn more about printing forms in QuickBooks, adding you some articles which you may find helpful:

• Align how your checks print
• How to print forms for window envelopes
• Print sales forms
• Fix print alignment for preprinted checks

You're always welcome to come by the Community if you have additional concerns. It's my pleasure to help. Have a fantastic day!