In your Globalprotect portal configuration, 'Resolve All FQDNs Using DNS Servers Assigned by the Tunnel (Windows Only)' option if set to 'Yes' - will enforce the client machine to resolve all the DNS queries through the tunnel.
In your Globalprotect portal configuration, 'Resolve All FQDNs Using DNS Servers Assigned by the Tunnel (Windows Only)' option if set to 'Yes' - will enforce the client machine to resolve all the DNS queries through the tunnel.