Hello there, @2357. I'd be glad to help you show the bills in the payment stub voucher in QuickBooks Online (QBO).

In QBO, you can only see 13 bills. To help you with this, you can either run the Transaction List by Vendor report or highlight the bills being paid within the Bill Payment window. I'll guide you on how. 

1. Navigate to the Business overview section and select Reports.
2. Then, in the Go to Report field and type Transaction list by Vendor.
3. Click the Transaction List by Vendor report.
4. Next, select the Customize button.
5. In the General section, change the reporting period to All Dates.
6. Then, from the Filter section, change the Last Modified Date to the date the check was entered into the program.
7. Select Bill in the Transaction Type section.
8. After that, select the vendor from the Vendor section.
9. Once done, select Run report.

Then, you can refer to this article to see the bills in the Bill Payment window: Showing all items in the Bill Payment voucher. 

If you have any other concerns managing your bills in QBO, please don't hesitate to leave a reply below. I'm always here ready to lend a hand. Have a good one and stay safe.