app/views/layouts/rails_admin/_navigation.html.erb
<div class="container-fluid">
<a class="navbar-brand" href="<%= dashboard_path %>">
<%= _get_plugin_name[0] || 'Rails' %>
<small>
<%= _get_plugin_name[1] || 'Admin' %>
</small>
</a>
<button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#secondary-navigation">
<span class="sr-only">
<%= t('admin.toggle_navigation') %>
</span>
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="secondary-navigation">
<%= render partial: 'layouts/rails_admin/secondary_navigation' %>
</div>
</div>