This field in XTRCTL allows toggling of "open ended" option for last display column. Previously, this was always set to TRUE, meaning that the last column was "open ended;" it expanded to fit the larger of the space available and the data in the column. Now, when xtr'closedended is set to 1, the open ended option is disabled, which should cause the final display column to adopt a fixed width, either as defined by the Dspwid=## option in coldef, or as it sees fit based on some internal heuristics.