This is in /etc/dnsmasq.conf
interface=eth0
# listen=192.168.4.1
dhcp-range=192.168.4.8,192.168.4.250,255.255.255.0,12h
server=8.8.8.8
# domain-deeded
bogus-priv
sudo systemctl restart dnsmasq.service
and sudo nmtui, edit connection, wired connection, edit ipv4 configuration, Manual (Shared) 192.168.4.1/24, ok