The Metadata zone appears on the Media Content Navigator below the command zone. You can expand it or collapse it independently of other navigator parts. By default, it is collapsed. Click the expander button to expand it. It expands upwards and it may cover the part or the entire results zone, if the vertical resolution is too small.
The Metadata zone contains various editable fields.
Note
The Metadata zone is defined under <objectUI name="editGallery" in Shell4_Config.xml.