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Hello,

'Heading 1' is not an allowed type (https://www.phpdocx.com/api-documentation/docxcustomizer/customize-docx-Word-documents-PHP):

type  string  * (all), break, image, list, paragraph, run, section, style, table, table-row, table-cell.

Please check the included sample examples/DocxCustomizer/sample_9.php that changes styles from the style target. For example:

$referenceNode = array(
    'target' => 'style',
    'type' => 'style',
    'attributes' => array('w:styleId' => 'myStyle'),
);

$docx->customizeWordContent($referenceNode, 
    array(
        'bold' => false,
        'italic' => false,
        'backgroundColor' => 'FF0000',
        'caps' => false,
        'lineSpacing' => 240,
    )
);

Please note the previous sample uses the attribute w:styleId that may not be the same that the style name. Heading1 should be the styleId for Heading 1 . Using parseStyles you can get the styles from an existing DOCX.

Regards.