Icarus uses the _config.yml file for global page layout, plugins and widgets settings. It will check and validate the configuration file, points out any misconfigurations, and generates one for you if none exists. You can check the specifications at any time from the `*.spec.js` files inside the `themes/icarus/includes/specs` folder.
Most of the settings are documented in the `_config.yml` file. For more details on configuring plugins, you can refer to the [online documentation](/hexo-theme-icarus/categories/).
Apart from the global theme configuration, you can also make customizations in any post. That is, you can override the theme configurations from a post. Let's say you want to show different navigation bar menus in a post. To do this, you only need to put the `navbar` settings in the post's front-matter:
The configurations you set here will be applied only to this post. This feature can be very useful for displaying customized/optimized pages to a specific audience. For example, you can enable faster CDNs or a localized comment service based on the country and language of the page viewers.
