QB Issue Resolution:

Customizing the statement layout is unavailable. Your feedback is important to us. I suggest sending a product request to our engineers by going to Gear, and then clicking Feedback.

Please check out this article for your reference: https://community.intuit.com/articles/1145736.

Resolution for Issue 'How do I change the the layout for statements? When I change the layout in settings, it only affects the invoices and estimates. The statement layout stays the same.' available: Yes (Solved).
Source: Intuit Community forum.

How do I change the the layout for statements? When I change the layout in settings, it only affects the invoices and estimates. The statement layout stays the same.: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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