It's fixed! I decided to bite the bullet and change the DHCP server from the router to the Raspberry Pi. I have tried several times before and locked myself out of the router and access to the network. This caused me to reset the router which is a pain.
From the pihole instructions, I found the /etc/dhcpcd.conf file was missing this entry:
static domain_name_servers=127.0.0.1
After adding that, I disabled the DHCP server on the router and enabled it on the Raspberry Pi. Also the print server that I installed on the Pi is working and my Windows machine can find it.
Therefore, this ticket should be closed.
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Expected Behaviour:
Version of Pihole
Core version is v6.1.2 (Latest: v6.1.2)
Web version is v6.2.1 (Latest: v6.2.1)
FTL version is v6.2.3 (Latest: v6.2.3)
Hardware/OS
Raspberry Pi 3/Debian 11
Sagemcom FAST5290 (web I/F updated by IP)
DHCP server - Sagemcom
Actual Behaviour:
After much fiddling, Pihole appears to be blocking queries but performance is poor depending on which browser I use. Ads appear on Chrome and Konqueror browsers but mostly absent on Firefox ESR.