Steps to reproduce :

• Insert search engine in a page
• Set it to search in contents
• Choose news and articles for example
• Use default context
• On criteria : Add a criteria based on tags ("a value set by the visitor among") and choose  several tags in tags available
• Clic on OK to end settings

In the service rendering you will have a dropdown (for tags criteria). The problem is that this dropdown displays only "All" instead of displaying "All" and choosen tags.

Also it is not possible to customize easily the tags criteria Label (Etiquettes), it should be nice to be able to customize it from search criteria settings.