After spending some time trying to solve this issue, I realize that I may not be as experienced with Bootstrap as I thought. Here's my dilemma: I am attempting to design a navigation bar using Bootstrap 4, where most menu items are on the left and the login button is on the right. Although I have come up with a solution (which might be incorrect), there seems to be a problem when viewing the page on a phone or tablet. The 'login' item disappears once the screen size goes below a certain point, around 760px. Below is the current markup of my code, any guidance would be greatly appreciated.
<a class="navbar-brand" href="#"><img src="imgs/branding/nerve logo_small.png" width="50" height="50" alt=""></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="index.php">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Placeholder 1</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Placeholder 2</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Placeholder 3</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Placeholder 4</a>
</li>
</ul>
</div>
<ul class="navbar-nav flex-row ml-md-auto d-none d-md-flex">
<li class="nav-item text-right">
<a class="nav-link " href="#">Login</a>
</li>
</ul>
</nav>