To center the Navbar horizontally use flexbox utilities.
Remove .ms-auto or .me-auto class and add .justify-content-center next to the .navbar-collapse to center the content.
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<!-- Container wrapper -->
<div class="container-fluid">
<!-- Toggle button -->
<button
class="navbar-toggler"
type="button"
data-mdb-toggle="collapse"
data-mdb-target="#navbarCenteredExample"
aria-controls="navbarCenteredExample"
aria-expanded="false"
aria-label="Toggle navigation"
>
<i class="fas fa-bars"></i>
</button>
<!-- Collapsible wrapper -->
<div
class="collapse navbar-collapse justify-content-center"
id="navbarCenteredExample"
>
<!-- Left links -->
<ul class="navbar-nav mb-2 mb-lg-0">
<li class="nav-item">
<a class="nav-link active" aria-current="page" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<!-- Navbar dropdown -->
<li class="nav-item dropdown">
<a
class="nav-link dropdown-toggle"
href="#"
id="navbarDropdown"
role="button"
data-mdb-toggle="dropdown"
aria-expanded="false"
>
Dropdown
</a>
<!-- Dropdown menu -->
<ul class="dropdown-menu" aria-labelledby="navbarDropdown">
<li><a class="dropdown-item" href="#">Action</a></li>
<li><a class="dropdown-item" href="#">Another action</a></li>
<li><hr class="dropdown-divider" /></li>
<li>
<a class="dropdown-item" href="#">Something else here</a>
</li>
</ul>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true"
>Disabled</a
>
</li>
</ul>
<!-- Left links -->
</div>
<!-- Collapsible wrapper -->
</div>
<!-- Container wrapper -->
</nav>