Column Widths property
This is where you explicitly specify column widths. Normally, the initial column widths are equal to the length of their column header. Using this property, you can overrule these default width for some or all columns. You provide a list of lengths (specified in number of characters) separated by spaces or commas.
For any column where you do NOT wish to override the default, fill in "0". For any column that has no overriding length specified, the default length is taken.