This window lets you view and edit the properties of the selected records. You can type Tab to move between to text fields, or Control-Tab to move out of the notes text view.

This shows the file’s name, kind, size, and dates, as well as EagleFiler metadata such as the title, source URL, and from.
If a record doesn’t have a title and you haven’t set one manually, EagleFiler will use the filename (without the extension) as the title, and the title will stay in sync with the filename if you rename it.