From Zentyal CLI (SSH, or opening a terminal)
samba-tool domain passwordsettings show
params.c:pm_process() - Processing configuration file "/etc/samba/shares.conf"
Password informations for domain 'DC=my,DC=domain,DC=tld'
Password complexity: on
Store plaintext passwords: off
Password history length: 24
Minimum password length: 6
Minimum password age (days): 0
Maximum password age (days): 0