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Hello there, @drkjmcn.
You'll want to go to your bank accounts and select the toggle OFF option to disconnect the connection of your bank. Here's how.
In your QuickBooks Self-Employed (QBSE):
Here's an article you can read for more details: Delete a bank account in QuickBooks Self-Employed.
I'm also adding this article that can help you categorize or edit transactions in your QBSE account: Categorize and edit transactions in QuickBooks Self-Employed.
Don't hesitate to get back to us if ever you need help. I'm always around to help. Take care and always stay healthy.