Remove redundant DNS servers in Ubuntu 22.04

Question

Ubuntu 22.04

Original:

root@ubuntu:~# resolvectl
Global
       Protocols: -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
resolv.conf mode: stub

Link 2 (ens5)
    Current Scopes: DNS
         Protocols: +DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
Current DNS Server: 12.34.56.78
       DNS Servers: 12.34.56.78 12.34.56.79

What I did:

1. Add nameservers entry in /etc/netplan/01-netcfg.yaml file

# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
  version: 2
  renderer: networkd
  ethernets:
    ens5:
      dhcp4: yes
      nameservers:
        addresses: [8.8.8.8, 1.1.1.1]

netplan apply

2. Add DNS servers in /etc/systemd/resolved.conf file

[Resolve]
DNS=8.8.8.8 1.1.1.1
FallbackDNS=8.8.4.4

systemctl restart systemd-resolved
systemctl enable systemd-resolved

After rebooting:

root@ubuntu:~# resolvectl
Global
           Protocols: -LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
    resolv.conf mode: stub
  Current DNS Server: 8.8.8.8
         DNS Servers: 8.8.8.8 1.1.1.1
Fallback DNS Servers: 8.8.4.4

Link 2 (ens5)
    Current Scopes: DNS
         Protocols: +DefaultRoute +LLMNR -mDNS -DNSOverTLS DNSSEC=no/unsupported
Current DNS Server: 8.8.8.8
       DNS Servers: 8.8.8.8 1.1.1.1 12.34.56.78 12.34.56.79

How to remove 12.34.56.78 and 12.34.56.79 in DNS server list?