nice to hear from you again.
I wonder, which setlist icon do you mean. There is a setlist button both in the Songbook and the Fakebook viewer. Both are for preparing or editing a setlist. If you want to use your previously prepared setlist, you have to switch from 'all songs' to 'set lists' below your song list. Those buttons do not use the icon from the preparation button.
I certainly have missed something.
have fun & make good music