=Configuration - Advanced=
==CAPTCHA on the Login==
If you enter the wrong email and password into the login page twice you will see a CAPTCHA. CAPTCHA stands for “Completely Automated Public Turing Test to tell Computers and Humans Apart”. It is used in this case to verify that a person and not an automated program is attempting to login.
You can toggle the CAPTCHA on or off for your entire system by going to Menu icon > Global Settings > Security tab > and choose either enabled or disabled. The inherit choice only affects signup pages and will not disable CAPTCHA on the login.
Note you can also choose to bypass the use of CAPTCHA for users in countries that are unable to communicate with CAPTCHA servers because of government policy. This is done by selecting a country such as China in the bypass setting.