clearColHeader = function clearColHeader(column, TH) {
        var headerSpanElement = (0, _utils.getHeaderSpanElement)(TH);

        if ((0, _utils.isFirstLevelColumnHeader)(column, TH) === false || headerSpanElement === null) {
          return;
        }

        _this4.updateHeaderClasses(headerSpanElement);
      }
Disables the plugin functionality for this Handsontable instance.