How do I control the width of each column in the table?

The overall table width is automatic - it will shrink or stretch to fit into your content area or div.  The column width in each table is determined by the maximum character count in that column. The individual column widths can not be controlled by the html codes provided by Jackrabbit.  The only way to control them would be to have a webmaster consume the table data and manipulate the output layout.  If you are placing several tables on the same webpage, consider inserting a few rows of descriptive text between each table to visually break up the page.  The tables look best when the Description column is not used (hidden).