Make Bootstrap 3.0 NavBar content always collapsed

Question

I need to make a section of a NavBar of Bootstrap 3.0 always collapsed.

Actual sections of the navbar:

• Links
• Search Form
• Login Form

When I open the website in a phone I see the three sections collapsed and I have three icons to collapse each of this content.

When I open the page in a PC i see the three sections in the bar visibles (not the buttons to collapse). What I need? In PC view only hide the Login form and show the button to collapse that login form. No matter the resolution i need to have the login button always visible and the section collapsed. This is my actual code:

<nav class="navbar navbar-inverse" role="navigation">
    <div class="navbar-header">
        <!--Toggles -->
        <button type="button" class="navbar-toggle boton" 
                data-toggle="collapse" data-target="#sesion">
            <span class="glyphicon glyphicon-user"></span>
        </button>
        <button type="button" class="navbar-toggle boton"
                data-toggle="collapse" data-target="#links" id="menuToggle">
            <span class="glyphicon glyphicon-align-justify"></span>
        </button>
        <button type="button" class="navbar-toggle boton" 
                data-toggle="collapse" data-target="#buscar">
            <span class="glyphicon glyphicon-search"></span>
        </button>
        <!--Logo en vista Mobile -->
        <a class="navbar-brand" style="padding: 10px 0 0 15px" href="#">
            <span class="visible-xs">
                <img src="img/nsnow.png" width="37" height="36" alt="Logo" />
            </span>
        </a>
    </div>

    <ul class="collapse navbar-collapse nav navbar-nav" id="links">
        <!--Links -->
        <li><a style="padding-left: 40px"></a></li>
        <li class="botonMenu" id="boton_generos"><a >Géneros</a></li>
        <li class="botonMenu" id="boton_categorias"><a >Categorías</a></li>
        <li class="botonMenu" id="boton_senales"><a >Señales</a></li>
    </ul>

    <div class="collapse navbar-collapse" id="buscar">
        <!--Buscar -->
        <form class="navbar-form navbar-right" role="search">
            <div class="form-group">
                <input type="text" class="form-control" placeholder="Buscar">
            </div>
            <button type="submit" class="btn boton">
                <span class="glyphicon glyphicon-search"></span>
            </button>
        </form>
    </div>

    <div class="collapse navbar-collapse" id="sesion">
        <!--Buscar -->
        <form class="navbar-form navbar-right" role="search">
            <div class="form-group">
                <input type="text" class="form-control" placeholder="Usuario">
                <input type="text" class="form-control" placeholder="Contraseña">
            </div>
            <button type="submit" class="btn boton">
                <span class="glyphicon glyphicon-search"></span>
            </button>
         </form>
     </div>
</nav>

Answer 1

For those using LESS, head to variables.less and change:

@grid-float-breakpoint:     @screen-sm-min;

to:

@grid-float-breakpoint:     999999999px;

One line change that works like a charm. Just be sure to use an unrealistically large number of pixels (em did not work for me).