you didnt answer his question at all... he asked for the VIEW of the panel window not how they work...
i have same problem and this link you provided didn't help at all...
I know right... Hope someone could find us a solution in the future
My Libraries panel looks just like yours. All of the icons are nested under the Plus. I think this change was made quite awhile ago, and the screen capture you reference showing all the icons along the bottom of the panel is old. Where did you find that from?
Do you know that it's possible to drag content into the library? The icons in the Library panel aren't absolutely required. The drag and drop method is the easiest.