How do I know my Pi-hole is working?

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Hi,
I've set up Pi-hole on a Raspberry Pi 4 to block unwanted adds. Works perfectly so far. I'd like to add some more privacy to my system and I've therefor installed unbound using the Pi-hole guide.

When running 'dig DOMAIN -p 5335' on the Raspberry Pi 4, it gets the correct information etc. So far so good. I then added "127.0.0.1#5335" to Custom 1 in the Pi-hole DNS configuration, unticked the boxes for the Quad9 DNS and restartet the DNS server.

If I know run 'dig DOMAIN' it gets the same results as before, but I can see it uses 127.0.0.1#53 as the server of choice (Pi-hole?). Is this the correct behaviour?

Is there some way that I can check Pi-hole does in fact use unbound (127.0.0.1#5335) as its DNS server? I've checked /etc/resolv.conf and /etc/dhcpcp.conf and here I get:

/etc/resolv.conf:
nameserver 127.0.0.1

/etc/dhcpcp.conf (the last line):
static domain_name_servers=9.9.9.11 149.112.112.11

Isn't this Quad9 servers? Am I doing something wrong?

Thanks!