btcpayserver/BTCPayServer/Views/Shared/_NavLayout.cshtml

@{
    Layout = "/Views/Shared/_Layout.cshtml";
    ViewBag.ShowMenu = ViewBag.ShowMenu ?? true;
    if (!ViewData.ContainsKey("NavPartialName"))
    {
        ViewData["NavPartialName"] = "_Nav";
    }
    var title = $"{(ViewData.ContainsKey("MainTitle")?  $"{ViewData["MainTitle"]}:" : String.Empty)} {ViewData["Title"]}";
}

<section>
    <div class="container">
        <div class="row">
            <div class="col-lg-12">
                @if (ViewBag.ShowMenu)
                {
                    <h4 class="section-heading">@title</h4>
                    <hr class="primary ml-0">
                }
            </div>
        </div>

        <div>
            <div class="row">
                <div class="col-md-3">
                    @if (ViewBag.ShowMenu)
                    {
                        @await Html.PartialAsync(ViewData["NavPartialName"].ToString())
                    }
                </div>
                <div class="col-md-9">
                    @RenderBody()
                </div>
            </div>
        </div>
    </div>
</section>
@section HeadScripts {
    @RenderSection("HeadScripts", required: false)
}

@section Scripts {
    @RenderSection("Scripts", required: false)
}