Desktop provides upcoming detail when you open it. Can the online version do the same?

Thanks for posting here, @sammykelly1022-g.

In QuickBooks Online (QBO) you can run reports to see the details of all your bill transactions. One of the reports you can pull up the Purchases by Vendor Detail Report.

This includes the Date, Transaction Type, Num, Product/Service, Memo/Description, Quantity, Rate, Amount and Total balance. To run the report, follow the steps below:

1. Select Reports from the left menu.
2. Type Purchases by Vendor Detail on the search box.
3. Click the Customize button on the upper right-hand corner. 
4. Maximize the Filter section.
5. Check the box for Transaction Type, and then select Bill.
6. Set the date range of the report.
7. Click Run report.

You may also customize this report to show the data you need. Here’s an article that will guide in customizing reports: Customize reports in QuickBooks Online. 

Please let me know if I can be of additional assistance or should you have any follow up questions. I’ll be here to help. Have a good one.