To achieve a margin-left:auto effect on your toggle button, simply include the ml-auto class.

<button type="button" class="navbar-toggler ml-auto hidden-sm-up float-xs-right" data-toggle="collapse" data-target="#navbarResponsive" aria-expanded="false" aria-label="Toggle navigation"></button>

Utilize the .float-xs-right class:

<button class="navbar-toggler hidden-lg-up float-xs-right" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation"></button>

Alternatively, you can add float: right; to the .navbar-toggler as shown below:

Please note that pull-right has been removed in version 4.

@media (min-width: 992px) {
  .navbar-nav li a {
    line-height: 85px;
  }
}
@media (max-width: 991px) {
  .navbar-brand {
    float: none;
  }
}
.navbar-toggler {
  border: none;
  width: 1em;
  float: right;
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/js/bootstrap.min.js"></script>
<nav class="navbar navbar-light bg-faded navbar-full">
  <a class="navbar-brand" href="#">
    <img class="img-fluid" src="img/logoMedium.png" />
  </a>
  <button class="navbar-toggler hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation"></button>
  <div class="collapse navbar-toggleable-md" id="navbarResponsive">
    <ul class="nav navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">About Us</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Solar Power</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">No Obligation Quote</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Contact Us</a>
      </li>
    </ul>
  </div>
</nav>

To achieve the desired outcome, add the pull-right class.

<button class="navbar-toggler hidden-lg-up pull-right" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation"></button>

Alternatively, you can use a custom style with the following settings:

float: right !important;

Check out this snippet of code:

    .navbar-toggler {  
  margin-right: 10% !important;
}

If you are using Bootstrap 5, a simple way to shift your toggler from left to right is by adding the 'ms-auto' class.

<button class="navbar-toggler ms-auto" 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>

Here is my solution to the problem:

<header>
    <nav class="navbar navbar-fixed-top navbar-dark bg-inverse">
        <a class="navbar-brand" href="#">Fixed top</a>
        <button type="button" class="navbar-toggler hidden-sm-up float-xs-right" data-toggle="collapse" data-target="#navbarResponsive" aria-expanded="false" aria-label="Toggle navigation"></button>
        <div class="clearfix"></div>
        <div class="collapse navbar-toggleable-xs" id="navbarResponsive">
            <ul class="nav navbar-nav">
                <li class="nav-item active">
                    <a href="#" class="nav-link">Home<span class="sr-only">(current)</span></a>
                </li>
                <li class="nav-item">
                    <a href="#" class="nav-link">Planets</a>
                </li>
                <li class="nav-item">
                    <a href="" class="nav-link">Spaceships</a>
                </li>
                <li class="nav-item">
                    <a href="" class="nav-link">About</a>
                </li>
                <li class="nav-item">
                    <a href="" class="nav-link">Contact</a>
                </li>
            </ul>
        </div>
    </nav>
</header>

It's important to include the clearfix to prevent any layout issues caused by floating elements when the menu collapses.

This is my preferred method for using Bootstrap 4:

<button type="button" class="navbar-toggler navbar-toggler-right"
        data-toggle="collapse" data-target=".navbar-collapse"
        aria-controls="navbar-collapse" aria-expanded="false" aria-label="Toggle navigation">

You can also use this simpler version from the Bootstrap documentation:

<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>

In order to properly align it with other button tags, you will need to first enclose it in a container for adjustment later. Then, create a div element with the .text-right class and place your toggle button inside. Take a look at the following example:

<div class='container'>
   <div class='text-right'>
      <button> Button1 </button>
   </div>    
</div>

Alternatively, you can use:

<div class='container text-right'>       
   <button> Button1 </button>       
</div>

Both of these approaches are effective when using Bootstrap 4.5.

To easily resolve your issue, simply incorporate the navbar-expand-lg class.

Your code snippet should resemble this example:

<nav class="navbar navbar-expand-lg navbar-light bg-light fixed-top">

After trying several solutions with no success, I came up with a simple hack that gets the job done:

HTML:

<nav class="navbar navbar-expand-lg navbar-light bg-light sticky-top">
  <div class="container-fluid">
    <div class="row d-inline">
      <div class="col">
        <a class="navbar-brand" href="{% url 'home' %}">
          <img src="{% static  'img/logo.png' %}" alt="Logo" height="100" class="d-inline-block">
          <span class="fs-2">Abstract Spacecraft</span>
        </a>
      </div>
      <div class="col">
        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" 
          aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation" id="as-navbar-toggler">
          <span class="navbar-toggler-icon"></span>
        </button>
      </div>
    </div>

CSS:

#as-navbar-toggler {
    position: absolute;
    right: 5px;
    top: 5px;
    height: 35px;
    padding: 0px;
}

Result (in Chrome's iPhone5 screen emulator): https://i.sstatic.net/uv01G.png

This hack works well because it has zero padding, allowing it to sit neatly above the default centered page title.