Phpmyadmin accessed internally

CLI used to install
bash hst-install.sh --hostname teste.com --multiphp yes --vsftpd no --proftpd yes --named no --exim no --dovecot no --clamav no --spamassassin no --iptables no --fail2ban no --api no --interactive no

v1.8.12
Ubuntu 22.04 (x86_64)

I would like to know how to disallow access to phpmyadmin via the (external) domain.

Making it safer and only accessible to the internal IP (10.0.100.1)