In addition to viewing the content in the way shown by 4YouSee, it is also possible to view them by category, from the main menu Content (1) > Content (2). Click on the List By Category option (3), located at the top right of the screen. When clicking on that option, the following will appear:
On this same screen you will also have the possibility to filter the contents so that you can delete them by category. To know more, you can visit the following article Delete Content