The width of a column can be set by its Width property. The width of a column determines the width of all cells contained within the column. When resizing a table, its columns can be resized too. That depends on the value of ColumnStyle, which specifies whether columns are with fixed width or they resize to keep column-to-table width ratio.

System.Object
    MindFusion.Diagramming.Column

Column Members
MindFusion.Diagramming Namespace