In which file should custom theme settings be added?

Custom theme settings in Liferay are typically added in the liferay-look-and-feel.xml file. This XML file serves as the configuration point for the theme and allows developers to define various settings such as the theme name, its templates, and custom configurations that can be used throughout the theme.

By utilizing the liferay-look-and-feel.xml, developers can ensure that their theme settings are recognized and processed properly within the Liferay platform. It acts as a guide for the theme engine, informing it of the attributes and properties of the theme being used.

The other options do not serve the purpose of defining theme settings effectively. For instance, custom-theme.js and main.js are typically used to manage JavaScript behaviors and functionalities associated with the theme but are not meant for configuration settings. Similarly, init_custom.ftl is a FreeMarker template file, generally used for rendering content, not for theme configuration. Thus, liferay-look-and-feel.xml is the appropriate file to add custom theme settings.