Column widths can be changed automatically, so that the total columns' width matches the grid's width. In this instance, changing the width of one column automatically changes the widths of other columns. This behavior is controlled by the view's TableView.AutoWidth property.
To prevent the width of an individual column(s) from being changed when resizing other columns, you should set its FixedWidth property to true.
To learn more, see Columns Layout and Width.