The focus of Content mode is creating, modifying, organizing and publishing Content items. Content mode is an interface for the repository, that is the place in which eZ stores all the content.
This mode lets you navigate the Content tree and edit any content present in it, as well as to move, copy and delete it. You can also create new content using the previously defined Content Types.
You can preview any Content within the tree, but the Content mode does not allow you to edit a Content item directly from this preview.