Hi there, banana1612.
Welcome to the Community. I can show you how to disconnect a bank account in QBO.
There are just a few steps to get this done. Here's how:
1. Click the Banking tab in the left navigation bar.
2. Make sure the account you'd like to delete is highlighted blue at the top of the page.
3. Select the small pencil icon in the top right corner of the blue box.
4. Click the Edit Account Info button.
5. Place a check in the box beside of Disconnect this account on save.
6. Choose Save and Close.
This article provides additional details on disconnecting and deleting accounts: https://quickbooks.intuit.com/community/Banking-and-bank-feeds/Disconnect-or-delete-an-account-from-....
I wish you and your business continued success. Feel free to reach out to me if you have any other questions.