Hello @classicpandp,
Welcome aboard to the Community. Let me share some steps so you can filter expense transactions in QuickBooks Online.
For transactions without a payee, I recommend running the Transaction List By Date report. You have the option to filter the report to only show non-specified transactions.
Here's how:
- On the left navigation bar, click Reports.
- Scroll down and select Transaction List By Date.
- Click Customize.
- Choose the date range.
- Press the drop-down arrow next to Name.
- Select Not Specified.
- Hit Run report.

- Click the expense transaction.

- Add the payee information.
- Press Save and close.
Additionally, I recommend visiting the following article to learn more about how to personalize reports in QuickBooks: Customize reports in QuickBooks Online.
Please know that I'm just a post away if you have any other questions related to your expenses in QBO. Take care.