When systemd-resolved enable ,you will see your /etc/resolv.conf like that:
nameserver 127.0.0.53
options edns0 trust-ad
search paysmart.local
To disable it ,please run this command:
systemctl disable systemd-resolved.service
systemctl stop systemd-resolved
And then update your /etc/resolv.conf example
echo > /etc/resolv.conf
tee /etc/resolv.conf << END
nameserver 8.8.4.4
nameserver 8.8.8.8
END
Nguyen Si Nhan