How do I remove bank accounts and their history?

Why would you want to do that - those are valid transactions that feed your financial reports and are the basis for income tax filing.

But, you would have to delete each transaction in the account and then delete the account.

or

just make the account inactive if you are no longer using it

Thanks.  I was doing the initial setup and added an account that isn't part of my business by mistake.  I was able to delink them but it still shows offsetting transactions in the opening balance account on charts.