Here, this fucking way:

ls -alh /usr/local/directadmin/data/users/*/php/php-fpm*.conf

Also:
da config-set php_fpm_max_children_default 40
systemctl restart directadmin
da build rewrite_confs
systemctl restart php-fpm73

P.S. Target guide:
https://docs.directadmin.com/webservices/php/php-fpm.html

# ┌────────── minute (0 - 59)
# │ ┌──────── hour (0 - 23)
# │ │ ┌────── day of month (1 - 31)
# │ │ │ ┌──── month (1 - 12)
# │ │ │ │ ┌── day of week (0 - 6 => Sunday - Saturday, or
# │ │ │ │ │ 1 - 7 => Monday - Sunday)
# ↓ ↓ ↓ ↓ ↓
# * * * * * command to be executed
#
# 0 - Sun Sunday
# 1 - Mon Monday
# 2 - Tue Tuesday
# 3 - Wed Wednesday
# 4 - Thu Thursday
# 5 - Fri Friday
# 6 - Sat Saturday
# 7 - Sun Sunday
#