GridView2.ExportToXlsx("OneMasterDetail.xlsx")

GridView2.OptionsPrint.PrintDetails = True
GridView2.OptionsPrint.ExpandAllDetails = True
GridView2.ExportToXlsx("AllMasterDetail.xlsx")

using DevExpress.XtraPrinting;

using (PrintableComponentLink link = new PrintableComponentLink(new PrintingSystem()))
{
    link.Component = GridControl2;
    link.CreateDocument(link.PrintingSystem);
    link.ExportToXlsx("AllMasterDetail.xlsx");
}