How do I disable Pi-hole automatic add 127.0.0.1 in resolv.conf

I have client connecting to my Pi-hole server (debian) IP: 192.168.1.2
My point is, on server it self, I dont like pihole always auto edit resolv.conf 127.0.0.1 to do DNS resolution. Anyway to disable or I can config this script?
It just simple for server it self to use 9.9.9.9 or 1.1.1.1 upstream server.
It wont affect those client to use 192.168.1.2 as DNS server.