marechai/Marechai/Areas/Identity/Pages/Account/Manage/_Layout.cshtml

@{
    if(ViewData.TryGetValue("ParentLayout", out var parentLayout))
    {
        Layout = (string)parentLayout;
    }
}
<h2>Manage your account</h2>
<div>
    <h4>Change your account settings</h4>
    <hr />
    <div class="row">
        <div class="col-md-3">
            <partial name="_ManageNav" />
        </div>
        <div class="col-md-9">
            @RenderBody()
        </div>
    </div>
</div>

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