Navigate to the Admin Panel > Domain Name > Security
Enable or disable the Captcha on the login page. If enabled an image is displayed on the domain login page. This image has some garbled text. The user has to enter the text in the image in addition to giving the vault id and password. Login is successful only if the text entered matches the text in the image. This feature is used by the system to confirm that the login page is being accessed by a human. The default value is disabled.