You can set the value of each parameter either by typing a custom value,
or leaving the Default value. In the latter case, Plesk uses the
values from the default web server configuration defined by the server
administrator (hosting provider).
Your values override the default ones. The only exception is the Deny
access to the site setting - IP addresses from the default
configuration, as well as the IP addresses specified by you, will all be
applied to your website. In case of a conflict (for example, when you
allow the IP address that is denied in the default configuration),
Apache uses your settings.
with