You can use the COLWIDTH attribute of the LSTCOL tag to determine the data width to be used by the column. If you do not specify this attribute, the data width and column formatting width are determined by the actual length of the column-heading. If the width of the column-heading text is greater than the COLWIDTH, it is used as the column formatting width.

The minimum width value is 1 and the maximum is the remaining available panel (or region) width. If the column-heading and the COLWIDTH attribute are omitted, the data width and column formatting width are determined by the TYPE value of the associated VARCLASS. If a VARCLASS TYPE value is not available, the size of the column variable name (specified by the DATAVAR attribute) determines the width.

You should code the COLWIDTH attribute with a value equal to the length of the table data variable.