IIS Manager features read from and write to corresponding configuration section(s) in the .config files hierarchy. For example, the Application Settings feature corresponds to the <appSettings> section in the web.config files, whereas the Directory Browsing feature corresponds to the <directoryBrowse> element in the <system.webServer> section.
Few exceptions read and write configuration into other locations outside of IIS that are different from the configuration files hierarchy. For example, the Server Certificates feature gets its settings from the certificate store on the local server, and the Management Service feature gets its settings from the registry on the local server.
Feature to Module Mapping
IIS Manager features ...