Information about the search function in categories
Under 
you can search through all available media files. There are several categories available for selection. The categories shown depend on the connected device and data format.
Available categories with Bluetooth® audio equipment:
Current tracklist
The folders and categories of the connected device are shown.
Available categories with audio files:
Current tracklist
Playlists
Folder
Albums
Artists
Tracks
Frequently played
Most recently added
Mood
Music genres
Year
Composers
Podcasts (Apple® devices)
Audiobooks (Apple® devices)
The categories are available as soon as the entire media content has been read in and analysed.