More than one "Conditional Forwarding" entry in the GUI

Follow-up: The feature for defining multiple server has landed in development-v6 and will definitely be released with Pi-hole v6.0. We are currently also working on a nicer user interface:

Multiple conditional forwarders works for me now. One per line on the GUI. I have multiple subnets and one domain. One pi-hole per subnet. DHCP on the routers. Port forwarding for DNS on the internal routers.

true,10.69.5.0/24,10.69.5.1,example.com
true,10.69.2.0/24,10.69.2.1,example.com
true,10.69.9.0/24,10.69.9.1,example.com

This is available since Pi-hole v6.0. Conditional forwarding (now called "reverse servers") is a list, so you can add as many entries as you like, each with its own address range, target server and domain. See Settings -> DNS, or the dns.revServers array in pihole.toml. Marking this as implemented.