I’d like to have the window title area display the full directory/name of the current buffer file and not just the name.
Add the following line to your init.el:
(setq frame-title-format "%S: %f")
A more sophisticated title might be:
(setq frame-title-format '("%S: " (buffer-file-name "%f" (dired-directory dired-directory "%b"))))
That is, use the file name, or the dired-directory, or the buffer name.