When a flow is locked without a password it can be unlocked without providing a password (i.e. no password is requested). This is useful to guard against accidental editing without protection against interference by another user.
To lock one or more flows without password, select the flows in the Flows pane, and perform one of these steps:
Switch displays a dialog requesting a lock password. Leave the password blank (i.e. click the dialog's OK button without entering any text) to lock the flow without a password.