Hello, mbgruber.

The Online version has a different way of showing the account details of a split transaction. I'll be guiding you on how to show them. 

Instead of looking at the register itself, you'll want to run the Transaction List with Splits report in QuickBooks Online. This will show all of the accounts booked to the check. Here's how to run it:

1. Go to Reports. 
2. Enter Transaction List with Splits in the search box. 
3. Change the date on the Report period if you want to show specific transactions within a period.
4. Hit Run report. 

This is what the report would look like with split transactions:

Note: This report will show the split transactions booked on all bank accounts. Filtering it with bank accounts only would omit the others.

Another report to accomplish this is the Transaction Detail by Account report. Simply search it on the Reports page again to run it. Then filter it show a specific bank account. Here's how:

1. After opening the report, click the Customize button.
2. Expand the Filter section. 
3. Check Account, then choose a specific bank account.
4. Click Run report. 

Next, you'll want to enable the Account column to see the booked accounts. Simply click the small gear icon, then check Account.

Note: This report lists the accounts line by line together with the expense or sales forms attached to them. You can change how the accounts are listed under the Group by drop-down menu. 

You can print the report or export it to Excel by using the report functions above the header.

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I'm happy to help you out again with other concerns or questions you might have. Add your replies here or create a new thread and I'll be there for you.