So it is easy enough to drag the bottom of a column in the Finder’s column view to change the width of that column. But, did you know you could hold down the Option key and it will resize all columns in all windows? And, better still, it will remember that new column width as the default. Also, Control+click on the bottom of a column to get more resizing options.
Related: iWork Numbers: Subtracting for Entire Column, Finding the End Of a Column and Adding Data To It?, iTunes Library Columns, How Do I In Large a Column In Numbers?, How Do I Make a Checklist That When Items Are Checked They Add a Certain Numeric Value To a Totals Column At the End Of the Checklist?.

Once again a great hint! Thanks