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Gatling uses a fallback strategy, where:
System properties > gatling.conf > gatling-defaults.conf
In the bundle packaging, gatling.conf is placed in the conf directory. It serves as an easy-to-edit base: all properties are commented and all values are the defaults.
In maven/sbt/gradle projects, it must be placed in the resources.
The name of this file can be overriding from a System property named gatling.conf.file, eg -Dgatling.conf.file=gatling-special.conf.
gatling-defaults.conf is shipped in the gatling-core jar and should not be edited.
If you want to override default values, you have two possibilities:
change the value in gatling.conf.
set a System property (the name of the property must match HOCON Path)