Hi there, @Carlos71. 

There are solutions you can perform when you can't deactivate an account. You can start by closing QuickBooks and running it again as an administrator.

Then, re-sort the Chart of Accounts list to make the accounts go back to their default order and undo the changes you made. This can often repair issues in your list that prevents you from deactivating bank feeds.

Here's how:

1. From the Lists menu, select either Chart of Accounts.
2. Mark the All Names checkbox.
3. Click Edit at the top left of QuickBooks.
4. Select Re-sort List.
5. Click OK.

I'm adding this article so you can perform other solutions if you're getting the same results: Fix issues when deactivating bank feeds.

Once done.  try to disconnect your bank from the Bank Feeds. Let me show you how to do it.

1. Go to Lists and then select Chart of Accounts.
2. Right-click the account you want to deactivate. Then select Edit Account.
3. Go to the Bank Settings tab.
4. Select Deactivate all online services and then OK to confirm.
5. Click Save & Close.

After disconnecting, restart your QuickBooks program for changes to take effect. Then, re-run it as administrator.

Once back in, go back to the Bank Feeds and connect your bank again. 

If the issue persists, I recommend contacting our QuickBooks Desktop Live Team. They can check if there are other things you need to do to further assist you.

Don't hesitate to post your concerns or let me know if you still have questions or clarifications about banking. I'll be here to help. Have a nice day!