When you eventually sort out the string diagram you will see why aoto arrange will not sort out such a large tree. It will need to be split into smaller parts.
I would suggest you try the options in the help file (press F1). Then start using the table (Ctrl +T) and sort by birth to find someone at top of one of a family line. Either move that person to a new Genomap or select direct descendants and move that family.
The results give a better family view than other family tree programs