Enabling Feature Flags in iThemes Security Pro allows you to try experimental features before they are released.
To enable the Feature Flag menu in iThemes Security Pro, you add the code below to your site's wp-config.php file above the "That's all, stop editing! Happy Blogging!" line. If needed, you can see how to edit the wp-config.php file in this article.
define( 'ITSEC_SHOW_FEATURE_FLAGS', true );
How to Enable Flags in the iThemes Security Menu
To enable an experimental feature, navigate to the Advanced page in the iThemes Security Pro settings and then click the Feature Flags Congifure Settings button.
Finally, check the box next to the feature you want to enable.