Found under: Settings > Display > Menu settings

You can adjust the song menu display as follows:

Part of the song menu showing the alphabetical index on the left (which is scrollable), the song title (or filename), author and folder/filename location of the song.  You can also see the 'Set item' checkboxes to the right indicating that the top song in the list is part of the current set.

Single character index with songs listed from 'L'

Two character index after clicking on 'L'

Large popup from drop-down font menu

Small popup from drop-down font menu