The Columns... button opens the Select Columns dialog box, which allows for selecting the columns to be displayed.
The Select Columns dialog box consist of the list of columns that can be displayed in the Element List window. Each column is represented by its name and the checkbox which defines the column visibility (checked means visible, unchecked hidden). The list of columns that can be displayed depend on the tab that is currently active in the Element List window, e.g. another columns can be displayed in the various tables available in Element Lists dialog box: Entity, Process, Connector.
In the gene network mode the Edge Comment might be displayed in a special way in the Edge table. Each comment item can be displayed in a separate table column. The user should be able to show/hide each one of these Comment columns.