get columnLayout() {
      return this._columnLayout;
    }
Returns the current column layout, based on both the <code>layout</code> property and the screen size.
<br><br>
<b>For example:</b> ["67%", "33%", 0], ["100%", 0, 0], ["25%", "50%", "25%"], etc,
where the numbers represents the width of the start, middle and end columns.
@readonly
@type {array}
@defaultvalue ["100%", 0, 0]
@name sap.ui.webc.fiori.FlexibleColumnLayout.prototype.columnLayout
@public