The function is triggered by this icon :
Two cases apply :
- when you run it on an album list, or from the control panel menu, it will shuffle albums list and play tracks of the randomly ordered albums keeping original order of the tracks in each album,
- when you run it on a playlist that may contain artists, albums and tracks, it will replace each artist with its album list, shuffle the entire playlist (which then contains only albums and single tracks), and play the resulting tracks in that order. You will notice that the original playlist is not modified, and when editing playing queue, you will not edit original playlist but a temporary copy.