Also would be nice if searching entire library had always the same sorting pattern, not depending on the playlist we're currently in.
I see a quite simple solution here. Or even 2:
1. "entire library" search should have the same panel settings (view, column, sorting) as "Music" panel
or
2.With the very first search of "entire library" rules could be set (columns, sorting) and remembered. This of course could be changed anytime.
This + a hotkey for nodes switching would be a nice improvement.
Also from my point of view this would make going to Music panel redundant. I'd be happy with it, as loading my Music panel causes frequent freezing issues (over 90 000 tracks in library).