Per Environment Configuration

The Config Override system is great for simple run-time config overrides. It should be preferred over Config Split for simple overrides such as for API keys on production or logging and error reporting settings in a development environment.

In fact the override system is also very useful for Config Split. The configuration of the splits are normal configuration and can be overwritten in settings.php. This allows you to make active a split that is normally not active or inactivate a split that is normally active.

You can override if a split is active or not, the weight of the split and folder of the split.

You should, however, not override the things that affects what gets written to the split folder, such as the complete-split modules or the complete and partial split configuration.