to fully quote from my book:

"You can program how the style responds to chord changes. There are 23 types of response to various chord changes, so that the actual pattern will play different notes, depending on which chord you play in the left hand.
For instance, the same variation will have a different pattern if you play a major a minor or a 7th chord. Or holding a note in the accomp after you change chord in the left hand, or keep an accomp straying too far from its inversion when you change chords!
This is not only programmable for each separate accomp track; it is programmable for each individual note of the accompaniment pattern in Step Record!
Experimentation here produces some startlingly good results to keep the backing fresh, inventive and interesting, let alone musically coherent as you play with the automatic chords - an extremely advanced feature with flawless triggering.
In addition, all of this is independently programmable for each note of each track of each of the 4 individual variations, and each of the 8 individual fills of each single composer.
Detailed explanation of this function requires in depth musical knowledge outside the scope of this discussion."

So to understand the programming you need a good grounding in chord theory, which obviously is outside that book criteria, it's a book in itself!

Basically unless using just C E G (for which there is a basic setting) the chord modify must be set to the correct type otherwise the style will sound the wrong notes in anything other than Cmaj.

Most of the chord tables are self explanatory in that the name describes the function so you have to choose the one that matches the notes used.

Incidentally Styleworks is a very good program but is certainly not infallible and the results often need editing to produce a professional result.