Thank you for posting here in the Community, @anonymous-8636e1.
Let me share some clarification about exporting a statement of account in QuickBooks Online.
Currently, an option or keystroke to export statements in that format is unavailable. As a workaround, you can either run the Customer Balance Detail or Summary report and download the data to Excel.
Here's how:
- On the left panel, click Reports.
- Scroll down to the Who owes you section.
- Select Customer Balance Detail or Customer Balance Summary.
- Press Customise.
- Make the necessary changes.
- Hit Run report.
- Click the export icon, then choose Export to Excel.

Since you can only download customer statements as PDF, I also recommend searching for a third-party application to convert the file to Excel.
Additionally, here are some helpful references that you can check out about how to customise statements and reports in QuickBooks Online:
If you have additional questions or concerns while working in QBO, leave a comment below. I’ll be happy to help you out.