Library content has moved from the bottom of the Inspector area to an overlay window, which can be moved and resized like Spotlight search. It dismisses once items are dragged, but holding the Option key before dragging will keep the library open for an additional drag.
The library can be opened via:
-
a new toolbar button (image attached);
-
the
View>Librariesmenu; -
or the ⇧⌘L keyboard shortcut.
