Nginx virtual host files (such as "/etc/nginx/sites-enabled/bm-client-access") are managed by BlueMind and must absolutely not be modified.
These files are replaced during system updates, as a result, all local modifications are lost.
You can, however, add configuration files into "/etc/nginx/sites-enabled/" to customize configuration.
By default, BlueMind can be included into a frame.
This behavior can be changed by adding the X-Frame-Options HTTP header to Nginx responses.
For more information on the X-Frame-Options response header, please refer to the Mozilla documentation.