使用 bootstrap 5 导航栏，我们如何让左对齐的项目在右侧溢出？

如果我理解您的要求，“就像右对齐的项目始终可见，而左对齐的项目溢出隐藏”，您将justify-content-end overflow-hidden在navbar-collapse..

<nav class="navbar navbar-expand-lg navbar-light bg-light">
    <div class="container-fluid">
        <a class="navbar-brand" href="#">Navbar</a>
        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse justify-content-end overflow-hidden" id="navbarSupportedContent">
            <ul class="navbar-nav me-auto mb-2 mb-lg-0">
                <li class="nav-item">
                    <a class="nav-link active" aria-current="page" href="#">Home</a>
                </li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
                <li class="nav-item"><a class="nav-link" href="#">LinkText</a></li>
            </ul>
            <ul class="navbar-nav">
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false"> Menu </a>
                    <ul class="dropdown-menu dropdown-menu-end" aria-labelledby="navbarDropdown">
                        <li><a class="dropdown-item" href="#">Action</a></li>
                        <li><a class="dropdown-item" href="#">Another action</a></li>
                        <li>
                            <hr class="dropdown-divider">
                        </li>
                        <li><a class="dropdown-item" href="#">Something else here</a></li>
                    </ul>
                </li>
            </ul>
        </div>
    </div>
</nav>

https://codeply.com/p/eqLnzoMJxD