https://www.amazon.com/Grace-Kings-D...s%2C329&sr=8-1
B00KU4O1CY
I bought it 1Aug2015. It doesn’t matter which reading app I use: no KFX features.
And many books I purchased before the advent of KFX now have KFX features, including my first purchase in 2009. But for some reason, this one does not (and in Content & Devices it does not show ‘update available’).
Quite possibly I have other books in this condition, but this is the only case I’ve encountered thus far.
I do have a few non-KFX, non-fixed layout books, but for these the store listing shows Enhanced Typesetting ‘not supported’.