All types of metadata fields have the tabs General, Search, Advanced, and Security. In addition to these are the different types of one or two tabs that are unique to that particular type of metadata. Read more about the unique tabs at the page Examples all metadata types.
The following settings can be done on the Security tab:
If this checkbox is ticked all users will see the metadata field.
If the metadata fiels only is to be shown for some roles tick the checkbox. The roles are the same as put up on the website.