Hello there, Hobson.
Were you trying to pull up all your transactions that are expensed by using the Purchases by Vendor detail report in QuickBooks Online (QBO)?
If so, know that the report will show transactions where items or services have been purchased and detailed under the Item Details section. Transactions categorized as expenses without such details won't appear in this report.
If your transactions fall under expenses rather than itemized purchases, they would be visible in the Expenses by Vendor Summary instead. You can run this report by following these steps:
1. Go to Reports from the left menu.
2. Enter Expenses by Vendor Summary in the Search box and select it.

3. Set the Report period.
4. Choose the Accounting method.
5. Pick Customize and select all the necessary information you need.
6. Click Run report.

You can visit this article to learn how to get the most out of your financial reports: Customize reports in QuickBooks Online.
Please let me know if there's anything else I can assist you with regarding these reports. Best regards!