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To keep single pane open always

By default, all Accordion panels are collapsible. You can customize the Accordion to keep one panel as expanded state always. This is applicable for Single expand mode.

razor
openalways.cs
@using Syncfusion.EJ2.Navigations;

@(Html.EJS().Accordion("defaultAccordion")
    .Clicked("clicked")
    .Expanding("beforeExpand")
    .Items(new List<AccordionAccordionItem> {
        new AccordionAccordionItem { Header = "ASP.NET", Expanded = true, Content = "Microsoft ASP.NET is a set of technologies in the Microsoft .NET Framework for building Web applications and XML Web services." },
        new AccordionAccordionItem { Header = "ASP.NET MVC", Content = "The Model-View-Controller (MVC) architectural pattern separates an application into three main components: the model, the view, and the controller." },
        new AccordionAccordionItem { Header = "JavaScript", Content = "JavaScript (JS) is an interpreted computer programming language.It was originally implemented as part of web browsers so that client-side scripts could interact with the user, control the browser, communicate asynchronously, and alter the document content that was displayed." }
    })
    .Render()
)

<script type="text/javascript">
    var clickEle;
    function clicked(e) {
        clickEle = e.originalEvent.target;
    }
    function beforeExpand(e) {
        var expandCount = this.element.querySelectorAll('.e-selected').length;
        var ele = this.element.querySelectorAll('.e-selected')[0];
        if (ele) {
            ele = ele.firstChild;
        }
        if (expandCount === 1 && ele === clickEle) {
            e.cancel = true;
        }
    }
</script>
public ActionResult Index()
{
    return View();
}