You can preset the following:
Chart Title - text; font; size
Chart Background - NONE, solid colour, image
Generations - maximum number of ancestor generations
Box Border - line width; colour; style
Box Fill - colour
Box Shadow - YES/NO
Box with Image - YES/NO; image position; image size
Name Line - capitalize; font; colour; size
Data Lines - content; font; colour; size;content of place data
Connection Lines - line width; colour; style
Highlight Relationship - line width, colour
Exclude Living Persons - YES/NO
Show duplicated persons - YES/NO

You can modify nothing.