carla/Docs/carla_settings.md

CARLA Settings

The CARLA plugin reads its settings from a "CarlaSettings.ini" file. This file controls most aspects of the game, and it is loaded every time a new episode is started (every time the level is loaded).

Settings are loaded following the next hierarchy, with values later in the hierarchy overriding earlier values.

1. {ProjectFolder}/Config/CarlaSettings.ini
2. File provided by command-line argument -carla-settings=<path-to-ini-file>
3. Other command-line arguments as -world-port, or -carla-no-networking
4. Settings file sent by the client on every new episode.

Take a look at the CARLA Settings example.

Important: If you are in editor, you most probably want to disable networking. Otherwise the game will hang until a client connects. Copy "Example.CarlaSettings.ini" to "CARLAUE4/Config/CarlaSettings.ini" and set UseNetworking=false.