You have the ability to delete media sources from your library. This can be helpful if a media source stops working, you need to make room for more sources, or you just don't want a certain source anymore. There are three ways you can delete media sources: individually, by selection, or by deleting all of them.
To Delete Individually
Find the media source you want to delete in your library then click the trashcan icon.
Confirm that you wish to delete the source in the dialog that comes up by clicking "delete".
To Delete by Selection
Tick the checkbox located at the top-left corner of every media source you wish to delete in your library.
When you've selected all the sources you wish to delete, click the "selected" button and then "delete".
Confirm that you wish to delete the selected sources in the dialog that comes by clicking "delete". Your library will reload and the selected media sources will be gone.
To Delete All Media
Simply click the "delete all media" link located menu bar near the top and confirm the dialog box that comes up. Your library will reload and all your media sources will be gone.