If ipconfig only shows the ipv4 and ipv6 addresses of Pi-hole for DNS and no others, this is fine ?
Can test both addresses displayed by ipconfig with nslookup on the Windows PC ?
nslookup pi.hole <PIHOLE_IPV4_ADDRESS>
nslookup pi.hole <PIHOLE_IPV6_ADDRESS>
Or even a naughty domain:
nslookup doubleclick.com <PIHOLE_IPV4_ADDRESS>
nslookup doubleclick.com <PIHOLE_IPV6_ADDRESS>
Can you post an example link, besides Youtube, that shows ads ?
Also if using ipv6, have a read here: