Bootstrap 4. How to arrange by grid if elements are in .container-fluid?

Question

Bootstrap

I'm trying to add a menu to the header, which is full screen, but for the menu to go along the grid, like at the bottom

. This does not work.

<div class="container-fluid ">
    <div class="row">
        <div class="col-12">
              ...menu content
        </div>
    </div>
</div>