For more information, see Using Your Assigned Administrative Rights in Securing Users and Processes in Oracle Solaris 11.4.
# svccfg -s svc:/network/ntp:default setprop config/verbose_logging = true
See the svccfg(8) man page for more information.
# svcadm refresh svc:/network/ntp:default # svcadm restart svc:/network/ntp:default
# svcprop -p config/verbose_logging svc:/network/ntp:default true