Thanks for sharing the details with me, @Anonymous.

You’ll want to adjust the date of the report to All. That way, it'll show all the classes. Then, look for the year 2019 transactions for reference. Let me show you how in your QuickBooks Desktop (QBDT) software.

Here's how:

1. Go to the Reports menu.
2. Select Reports Center.
3. Type Transactions List by Vendor from the search field.
4. Click Run to open the report.
5. Select Customize from the top menu.
6. Click the Filters tab.
7. Select Class from the filters menu.
8. From the Class drop-down menu select Multiple classes and choose the class of your choice then click OK. 

You can also check this link for more details in customizing reports in your QBDT software.

Once done, you can memorize the report to save its current settings. This way, you won’t have to customize it in case you need to run it again in the future.

Let me know if you have other concerns about reports in your QBTD software @Anonymous, it’s always my pleasure to help you anytime. Have a great day ahead.