Please note that it maybe desirable to select a common name for a free column when using ADIF export as described in the ADIF specifications at http://www.hosenose.com/adif/adif.html, section 3: Field Definitions.
The log-editor can also be used to set the columnwidth of the log. You should enter a number higher than 20. Changes to the column width will apply to all the logs that are currently open. Only the number column allows a zero width, you can use it to hide this column.