These websites are the most requested sites such as Antivirus updates sites, Google sites, Microsoft Office and Office 365….
They are added for performance reasons because whitelisted websites pass trough all filter processes (authentication, SSL decrypt, Web-filtering, acls..)
On Your Proxy > Global Rules > Whitelist, click on “Configuration file”
You can see that Artica have already added some destinations IP addresses and Web sites.

Your Proxy > Global rules section, turn OFF the Enable the Internet/proxy Compatibilities