QB Issue Resolution:

The easiest way is from the register. You can delete them rather quickly, then make the acct. inactive., which is delete in qbo.

Resolution for Issue 'How do I remove my bank accounts? My accounts aren’t linked, however I did download transactions and I want to wipe the lot' available: Yes (Solved).
Source: Intuit Community forum.

How do I remove my bank accounts? My accounts aren’t linked, however I did download transactions and I want to wipe the lot: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

Support for acct inactive
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Error Recovery for acct inactive [Canada]
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