Seeing folder's full content of all its playlists inside.

Hi, 

I find this option, existing in Serato or Traktor, is missing and vital for time efficient DJaying.
Having, for ex., folders by music genres is basic and crucial for DJS' music libraries, those include several playlists by sub-genres (ex. tracks in English, or in French).

When I click on any folder containing sub playlists, I cannot see any tracks inside because the option does not exist yet :

I'd like an OPTION allowing me, or not, to see the entire folder's content of its playlists all together. Thanks in advance.

That's an urgent need to me, best regards. Beatrice :)