This link is a very concise note on how to hide the "All Site Content" shortcut
Also to hide the Search bar - update the Master Page v4.Master and add the style below in red.
….class="s4-search s4-rp " style="display:none"
Tech. reference and notes discovered whilst thrashing Microsoft SharePoint, SQL, BI, KM, Security and Windows Servers
$w.Lists.Delete([System.Guid]$w.Lists["My List Name"].ID) Step B - toggle list cannot be deleted error
$list =
$w.Lists["My List Name"]
$list.AllowDeletion = $True
$list.Update()
The delete command will now be visible on your list settings again and you'll run the line below:
$list.Delete()
Blog Ref:
http://jessepatricio.blogspot.com/2011/12/could-not-save-list-changes-to-server.html