Is there a report to show invoices paid on a bill payment when they don't fit on the check stub?

Yes, there is, @cweaver3.

You can pull up the Bills and Applied Payments report in QuickBooks Online (QBO). This will show the list of payments you've made and the bills that go with them. To pull this up, here's how:

1. Go to the Reports menu.
2. Type in Bills in the search box, then select Bills and Applied Payments.
3. Select the Customize button to filter the info you need.
4. Click Run report.

After that, you can memorize the said report to save its current customization settings. For the step-by-step guide, you can check out this article: Memorize reports in QuickBooks Online. It also includes details about exporting and editing/deleting a memorized report.

Additionally, here's an article that shows the complete list of available reports per QBO version: Reports included in your QuickBooks Online subscription.

Please know that you're always welcome to comment below if you have other concerns or follow-up inquiries about monitoring expense transactions in QBO. I'm just around to help. Take care.