This section contains general In-bulletin settings, which are not related to the topics. In the current version, it has only one setting. ‘Select Module Root Category' allows the administrator to specify the module root category of In-bulletin. Clicking on the folder shortcut button will pop up a category picker. 
The module root category is used in several ways. On the front-end, in the Default theme, the top menu links each module to its module root category. Therefore, the ‘Forums' menu item will open this category and its contents. In the Administrative Console, this setting provides a faster way to navigate in the module, as it presets the category for module-specific actions.