setup questions

I set up the CLI on an EdgeRouter X, seems to be working fine.

Also on the router, I set the DHCP server to hand out the router IP for the DNS server.

In the logs, I see queries from one of my machines, a Synology. No other devices are showing up, even though I can confirm they're using the router IP for DNS, which I think means it should be using NextDNS?

Why aren't other devices appear in the logs? Until now I was using a pi-hole setup, and they all appear there.