DirectAdmin uses the default webalizer settings by not specifying a webalizer.conf file at all. If you want to adjust the settings for webalizer, you can create your own basic webalizer.conf file for DA to use. This file must be domain independant because this one file will be used for all domains without any modifications to it.
Create:
/usr/local/directadmin/data/templates/custom/webalizer.conf
Add the custom settings you wish to use to that file.
Example webalizer.conf file:
Do reverse IP lookups:
DNSCache /var/cache/|DOMAIN|.dns_cache.db DNSChildren 10
*Note, using tokens in this file requires DA 1.24.0 or later.