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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.

tagHelper
collapseall.cs
<ejs-grid id="Grid" dataSource="@ViewBag.DataSource" allowGrouping="true" dataBound="bound">
<e-grid-groupsettings columns="@(new string[] {"ShipCountry"})"></e-grid-groupsettings>
    <e-grid-columns>
        <e-grid-column field="OrderID"  headerText="Order ID" isPrimaryKey="true" textAlign="Right" width="100"></e-grid-column>                
        <e-grid-column field="CustomerID" headerText="Customer ID" type="string" width="120"></e-grid-column>                
        <e-grid-column field="Freight" headerText="Freight" textAlign="Right" format="C2" editType="numericedit" width="120"></e-grid-column>                               
        <e-grid-column field="ShipCountry" headerText="Ship Country" width="150" editType='dropdownedit'></e-grid-column>                
    </e-grid-columns>
</ejs-grid>

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