BTW, just for the record:
Virtualmin just installed the latest version (hopefully). Its not doing anything different then if you installed yourself
It is apparently different if you install via a script. According to everything I can find on the internet, PHPMyAdmin is supposed to have a phpmyadmin.conf file, or a phpmyadmin/apache.conf file, or a /etc/phpmyadmin/ folder containing a .conf file, or an /etc/httpd/ subfolder of some sort containing a .conf file related to PHPMyAdmin.
I can’t find any such thing anywhere on my install, and according to Phpmyadmin conf file for virtualmin/webmin, others haven’t been able to either and concluded that it doesn’t exist in the installation you get via virtualmin.