It may be using the systemd-timesyncd.service in which case /etc/systemd/timesyncd.conf controls (in part) what server it connects to. On the other hand, it appears to be saying that you don’t have an NTP service.
timedatectl timesync-status
systemctl status systemd-timesyncd
I don’t know whether that is a thing or even desirable. Why would you want to do that?
You can control how frequently it uses NTP to synch the time, if that is sufficient. It is doubtful that you would need to increase the frequency of updates over the default. I’ve actually decreased the frequency.