code: public function shiftColumn($fromColumn, $toColumn)
      {
          $fromColumn = strtoupper($fromColumn);
          $toColumn = strtoupper($toColumn);
  
          if (($fromColumn !== null) && (isset($this->columns[$fromColumn])) && ($toColumn !== null)) {
              $this->columns[$fromColumn]->setParent();
              $this->columns[$fromColumn]->setColumnIndex($toColumn);
              $this->columns[$toColumn] = $this->columns[$fromColumn];
              $this->columns[$toColumn]->setParent($this);
              unset($this->columns[$fromColumn]);
  
              ksort($this->columns);
          }
  
          return $this;
      }
docs: Shift an AutoFilter Column Rule to a different column.
  
  Note: This method bypasses validation of the destination column to ensure it is within this AutoFilter range.
  Nor does it verify whether any column rule already exists at $toColumn, but will simply override any existing value.
  Use with caution.
  
  @param string $fromColumn Column name (e.g. A)
  @param string $toColumn Column name (e.g. B)
  
  @return AutoFilter