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Let me get the help you need in deleting the contacts you've accidentally downloaded, @lapoolconsultant.
In QuickBooks Online (QBO), there are two ways on how to delete a customer or vendor.
Here's the option 1:
Here's the option 2:
For more information about this process, take a look below articles:
In case you'd like to run reports to show active customers or vendors only, you can do so by customizing the reports.
That's it! If I can be of additional assistance, let me know by commenting below. I'm here to back you up. Take care and have a great day!