When the new style system is used, as FpSpread.LegacyBehaviors doesn't contain LegacyBehaviors.Style, default values of the following properties for the newly created FpSpread instance will be changed:

1. SheetView.Protect will be set to false.
2. Cell.Locked will be set to true.

When the new style system is used, setting DefaultStyle won't have any effect. For example,

//Changing any properties of DefaultStyle won't have effect
fpSpread1.ActiveSheet.DefaultStyle = new StyleInfo() {BackColor = Color.Red};
fpSpread1.ActiveSheet.ColumnHeader.DefaultStyle.BackColor = Color.Yellow;
fpSpread1.ActiveSheet.RowHEader.DefaultStyle.ForeColor =  Color.Blue;
fpSpread1.ActiveSheet.RowHeader.DefaultStyle.HorizontalAlignment = CellHorizontalAlignment.Right;