open-nomad/ui/app/templates/components/gutter-menu.hbs

<div class="page-column is-left">
  <div class="gutter">
    <aside class="menu">
      <p class="menu-label">
        Workload
      </p>
      <ul class="menu-list">
        <li>
          <select
            class="menu-item"
            onchange={{action (queue
              (action (mut system.activeNamespace))
              (action onNamespaceChange)
            ) value="target.value"}}>
            {{#each system.namespaces as |namespace|}}
              <option value="{{namespace.name}}" selected={{eq namespace system.activeNamespace}}>
                {{namespace.name}}
              </option>
            {{/each}}
          </select>
        </li>
        <li>{{#link-to "jobs" activeClass="is-active"}}Jobs{{/link-to}}</li>
      </ul>
      <p class="menu-label">
        Cluster
      </p>
      <ul class="menu-list">
        <li>{{#link-to "nodes" activeClass="is-active"}}Clients{{/link-to}}</li>
        <li>{{#link-to "servers" activeClass="is-active"}}Servers{{/link-to}}</li>
      </ul>
    </aside>
  </div>
</div>
<div class="page-column is-right">
  {{yield}}
</div>