Disconnect via the Connected Services Popup
From the user menu in the top right corner of the screen, select the ‘Connected Accounts’ menu option.

After selecting this option, you will see a screen showing your Xero connection status. If your Xero connection is connected, you will see this shown as ‘(Active)’
Select the ‘Disconnect Xero’ button to revoke access to this Xero organisation.

Verify that your account is disconnected
You can verify at any time that your account has been successfully disconnected by returning to the ‘Connected Accounts’ menu. If the Xero organisation is disconnected, you will see this connection reported as ‘(Disconnected)’