Bootstrap4.1 Navbar Vertical items instead of Horizontal Album Example - html

Question

I am using 'Album' example from Bootstrap 4.1 and unable to get the extra nav-items to display horizontally.
I tried to add 'navbar-expand-lg', and it brings all to horizontal line. But, the toggler-button (and hence its header data) vanishes and becomes inaccessible.
Code as below;
<script src="http://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="http://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link href="http://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" rel="stylesheet"/>
<header>
<!-- Navbar#1 Toggled - Detailed Header Info-->
<div class="collapse bg-dark" id="navbarHeader">
<div class="container">
<div class="row">
<div class="col-sm-8 col-md-7 py-4">
<h4 class="text-white">About</h4>
<p class="text-muted">Lines of Data Shortened.</p>
</div>
<div class="col-sm-4 offset-md-1 py-4">
<h4 class="text-white">Contact</h4>
<ul class="list-unstyled">
<li>Follow on Twitter</li>
<li>Like on Facebook</li>
<li>Email me</li>
</ul>
</div>
</div>
</div>
</div>
<!-- Navbar#2 Permanent Strip of Navbar -->
<div class="navbar navbar-dark bg-dark shadow-sm">
<div class="container d-flex justify-content-between">
<a href="#" class="navbar-brand d-flex align-items-center">
<!-- SVG Album Icon -->
<strong>Album</strong>
</a>
<!-- Nav Items Manually added -->
<div class="navbar-nav mr-auto">
<a class="nav-item nav-link active" href="#">Home <span class="sr-only">(current)</span></a>
<a class="nav-item nav-link" href="#">Features</a>
<a class="nav-item nav-link" href="#">Pricing</a>
<a class="nav-item nav-link disabled" href="#">Disabled</a>
</div>
<!-- Navbar#3 - Visible Toggle Button -->
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarHeader" aria-controls="navbarHeader" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
</div>
</div>
</header>

Answer 1

Add float: left;CSS to your li items.
Also you can try this
https://www.w3schools.com/bootstrap/tryit.asp?filename=trybs_navbar&stacked=h

Answer 2

I got the answer.
The navbar was a flexbox with 'd-flex'. So, I added a 'flex-row', which brings nav-items horizontally. 'mr-auto' brings margin properly.
<script src="http://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="http://stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link href="http://stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css" rel="stylesheet"/>
<header>
<!-- Navbar#1 Toggled - Detailed Header Info-->
<div class="collapse bg-dark" id="navbarHeader">
<div class="container">
<div class="row">
<div class="col-sm-8 col-md-7 py-4">
<h4 class="text-white">About</h4>
<p class="text-muted">Lines of Data Shortened.</p>
</div>
<div class="col-sm-4 offset-md-1 py-4">
<h4 class="text-white">Contact</h4>
<ul class="list-unstyled">
<li>Follow on Twitter</li>
<li>Like on Facebook</li>
<li>Email me</li>
</ul>
</div>
</div>
</div>
</div>
<!-- Navbar#2 Permanent Strip of Navbar -->
<div class="navbar navbar-dark bg-dark shadow-sm">
<div class="container d-flex justify-content-between">
<a href="#" class="navbar-brand d-flex align-items-center">
<!-- SVG Album Icon -->
<strong>Album</strong>
</a>
<!-- Nav Items Manually added -->
<div class="navbar-nav flex-row mr-auto">
<a class="nav-item nav-link active" href="#">Home <span class="sr-only">(current)</span></a>
<a class="nav-item nav-link" href="#">Features</a>
<a class="nav-item nav-link" href="#">Pricing</a>
<a class="nav-item nav-link disabled" href="#">Disabled</a>
</div>
<!-- Navbar#3 - Visible Toggle Button -->
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarHeader" aria-controls="navbarHeader" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
</div>
</div>
</header>