Deleting Test Form Data in E10?

I just migrated to E10 and I cannot figure out how to delete test form data. My entire sales team decided to submit an event registration form as a test, but they're not actually meant to be registered. I'm being asked to remove them from the form submission data report. Is this possible in E10?

I know I can remove them from the shared list, but the problem is this form is collecting a bunch of data that we're not saving to the contact table, so it will not appear in the shares list fields, it can only be seen in the form submission data report.