This is an image of the top portion of the Library. The drop-down arrow button is circled to indicate that it is selected, which opens the sub-menu of commands for the Library panel and contents. The list includes viewing modes (View as List or View as Sections) for the Library contents. The next section in the sub-menu includes importing commands (Import JAR/FXML file and Import Selection) that allow you to add custom elements into the Library. The last command, Custom Library Folder, is selected in the image and displays two sub-commands (Reveal in Explorer and show JAR Analysis Report).