Bootstrap 4에서 Navbar가 축소되는 경우에도 Navbar 항목을 계속 표시하는 방법은 무엇입니까?

<code class="html"><nav class="navbar fixed-top navbar-light navbar-expand-lg navbar-template">
    <a class="navbar-brand" href="#">Navbar</a>
    <div class="d-flex flex-row order-2 order-lg-3">
        <ul class="navbar-nav flex-row">
            <li class="nav-item"><a class="nav-link px-2" href="#"><span class="fa fa-facebook"></span></a></li>
            <li class="nav-item"><a class="nav-link px-2" href="#"><span class="fa fa-twitter"></span></a></li>
            <li class="nav-item"><a class="nav-link px-2" href="#"><span class="fa fa-youtube"></span></a></li>
            <li class="nav-item"><a class="nav-link px-2" href="#"><span class="fa fa-linkedin"></span></a></li>
        </ul>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown">
            <span class="navbar-toggler-icon"></span>
        </button>
    </div>
    <div class="collapse navbar-collapse order-3 order-lg-2" id="navbarNavDropdown">
        <ul class="navbar-nav ml-auto">
            <li class="nav-item"><a class="nav-link" href="#">Home</a></li>
            <li class="nav-item"><a class="nav-link" href="#">Features</a></li>
            <li class="nav-item"><a class="nav-link" href="#">Pricing</a></li>
            <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown">Dropdown link</a>
                <div class="dropdown-menu dropdown-menu-right">
                    <a class="dropdown-item" href="#">Action</a>
                    <a class="dropdown-item" href="#">Another action</a>
                    <a class="dropdown-item" href="#">Something else here</a>
                </div>
            </li>
        </ul>
    </div>
</nav></code>