Just a little addition to what Ian said.
If double clicking one after another is a bit of a nuisance, there is a possible alternative.
Now this is no big help if you need to it just once, but if you do it often it can save a lot of time.
You can open libraries, just like any other files, using the "open" command in Terminal.
How can this help viz double clicking them in the Finder, you may ask.
Say you have to open the same four libraries in order, so that they appear in the browser as
A
B
C
D
You can do it in Terminal using
open D C B A
So here is way to do it quickly:
1a) Open Terminal and type
open
(no return at the end, but a space)
1b) Drag each of the libraries D, C, B, A in that order and drop them in the Terminal window
1c) Press return
Now the good thing is you need to do this just ONCE for this set of libraries.
Just copy the final command, which may look like
open /Users/me/Movies/D.fcpbundle /Users/me/Movies/C.fcpbundle /Users/me/Movies/A.fcpbundle /Users/me/Movies/A.fcpbundle
and you can keep it as a Shortcut, a snippet you can expand, or even just as a text saved somewhere than you can copy and paste back to Terminal when needed.
Again, it seems to much work if you only do this once or twice, but if you need it often, you can easily make this a Shortcut or Automator Quick Action and execute with one keyboard shortcut.
