Open and close libraries
You can open and close libraries in the Libraries list as needed, so that you never have too many libraries open at once.
The Close Library command is particularly important if you want to disconnect an external hard disk containing an open library.
Tip: To open specific libraries open when you open Final Cut Pro, option-click the Final Cut Pro application icon in the Dock, then select one or more libraries in the list and click Choose. To select more than one library: Command-click the libraries in the list.
To open or close libraries in the Libraries list
Do any of the following:
To open an existing library: Choose File > Open Library and choose a library from the submenu, or double-click a library file in the Finder.
To close a library: Select the library in the Libraries list and choose File > Close Library.