I'm trying to switch between the ligatures options mentioned in the video tutorial Open Type Typography, by going to Text -> Ligatures -> Use All or -> Use None, and there doesn't seem to be any difference between the two.
I have tried about 10 different fonts including Snell Roundhand, Zapfino, Gabriola and Footlight MT Light. No difference in appearance whether Use All or Use None selected
Also I have tried doing it by opening the Typography options box but the Ligatures section isn't even there.
Please see attached screenshots. What am I doing wrong?