The sorting already helps a lot. But if you look at the attached screenshot because you do not use the available space its still a pain to work with it.
Assuming that you need a computer with at least 1024 px resolution it could easely be made wider. I would even love to get it a bit higher to to loose the last scrollbar.
Not so much a problem if you have 3-5 libraries but once you have 50+ it rellay makes a difference.
Hope you are considering this really and implement this in 5.5 (or 6.0) if this is the next version.