Hi there,
I can walk you through the procedures of customizing your reports in QuickBooks Online (QBO).
Before we start, make sure your version of QuickBooks is up-to-date. This can also fix minor issues when exporting reports from QuickBooks to Excel.
It's possible that your QuickBooks Desktop version isn't compatible with your current version of Microsoft Office. With that, you can check each system requirements for QuickBooks Desktop below:
If everything is up-to-date and you're still having trouble exporting it to excel, you can follow the steps in this link from Microsoft to repair Microsoft Office.
If the issue persists, you can proceed in the next step outlined in this article (Step 5: Reinstall QuickBooks Fix export to Excel issues in QuickBooks Desktop.
Let me know how it goes or if you have other concerns about managing your reports in QuickBooks Desktop. I'd be glad to help. Have a great day!