You can delete or hide accounts that you do not want to see in the account list:

Hide an account:

'Accounts'> 'Select account'> 'Select dropdown next to the account'> 'Hide this account'

Delete an account:

'Accounts'> 'Select account'> 'Select dropdown next to the account'> 'scroll down' > 'Delete this account'

or

'Settings'> 'Select bank access' > 'Select account' > 'Delete this account'