The
Visibility column is added to the Libraries tab of the Materials tool window. Click an
icon in this column in order to hide a corresponding library or a folder of a library.
You can
Show invisible items using the contextual menu of libraries list.

In result, all elements will be displayed regardless of their visibility. Click an
icon in the Visibility column in order to make a corresponding invisible element visible again.
You can switch back to the default representation, where invisible elements are hidden, using the
Hide invisible items command in the contextual menu of libraries list.
