This variable applies only in text-mode environments. When FULL_BOXES is set to "1" (on, true, yes) a full, four-sided box is drawn around boxed entry fields. By default, to save screen space on character-based systems, only the left and right edges of a box are drawn around boxed entry fields. The default value of FULL_BOXES is "0" (off, false, no).
Note: This variable requires that the boxed entry field be defined as MULTILINE.