Missing Logout link

Go to Storefront › Script Manager then Create a Script. then copy and paste below

Javascript.

<script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script>
    $('.navBar--account ul.navBar-section').append(`
    <li class="navBar-item">
    <a class="navBar-action" href="/login.php?action=logout">Logout</a>
        </li>
    `);
</script>