Auto size

By default the exported file be automatically auto sized. To change this behaviour you can either change the config or use the setters:

// Set auto size for sheet
$sheet->setAutoSize(true);

// Disable auto size for sheet
$sheet->setAutoSize(false);

// Disable auto size for columns
$sheet->setAutoSize(array(
    'A', 'C'
));

The default config setting can be found in: export.php.