Display submenu on public page

Thanks Jerome (@robby78)!

Did you try flushing all caches?

Hello,

Yes I flushed all the cache.

I found that since the new version of Drupal, there is a class toolbar-loading inside html balise.

This selector with float left

.toolbar-loading.toolbar-horizontal .toolbar .toolbar-tray .toolbar-menu > li, .toolbar .toolbar-bar .toolbar-tab, .toolbar .toolbar-tray-horizontal li {
    float: left;
}

Is stronger that

.toolbar-tray-horizontal li.hover-intent ul li {
    float: none;
}

I don't know why Drupal add class toolbar-loading... With a fresh install of Drupal with just Drupal and Admin Toolbar everything is OK :)

Maybe it's a JS problem that don't remove the toolbar-loading class when the page is ready