1. Un-check this option from wordpress settings

2. Remove user menu from header

Remove any page with register/login shortcodes from Admin – Pages.

Do not use the WP Estate Login / Register widget on any sidebar.

If you wish to not allow users to register to save favorites either, see this help

http://help.wpresidence.net/2015/12/14/how-to-disable-user-registration-no-register-and-no-login-options/