The Fixed Column Output command is used for forcing the Column Width field to be an absolute value. Without this switch set the column Width field is more flexible. Use this command when the column width is critical in the report but be aware that it may cause data fields to be truncated with the possibility of losing the end of the data.
Max Line Length
Related to this is the Max Line Length command. Use this to force each line to be truncated to the supplied length.
Check the Fill With Spaces box to add the correct number of spaces to each line that falls short of the required line length.