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Collapse all grouped rows at initial render

You can collapse all the grouped rows at initial rendering by using DataBound event with collapseAll method of the grid.

In the below demo, all the grouped rows are collapsed at initial rendering.

razor
collapseall.cs
@Html.EJS().Grid("Grid").DataSource((IEnumerable<object>)ViewBag.dataSource).DataBound("bound").Columns(col =>
{
   col.Field("OrderID").HeaderText("Order ID").IsPrimaryKey(true).Width("120").TextAlign(Syncfusion.EJ2.Grids.TextAlign.Right).Add();
   col.Field("CustomerID").HeaderText("Customer Name").Width("150").Add();
   col.Field("Freight").HeaderText("Freight").Width("120").Format("C2").TextAlign(Syncfusion.EJ2.Grids.TextAlign.Right).Add();
   col.Field("ShipName").HeaderText("Ship Name").Width("150").Add();
   col.Field("ShipCountry").HeaderText("Ship Country").Width("150").EditType("dropdownedit").Add();

}).AllowPaging().AllowGrouping().GroupSettings(group => group.Columns(new string[] { "ShipCountry" })).Render()

<script>
    var initial = true;
    function bound() {
        if (initial === true) {
            this.groupModule.collapseAll();
            initial = false;
        }
    }
</script>
public IActionResult Index()
{
    ViewBag.DataSource = OrderDetails.GetAllRecords();
    return View();
}