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<?php
/**
 * Gravity Wiz // Gravity Forms // Hide Field on Entry Detail
 * http://gravitywiz.com/
 */
// update "123" to your form ID; "6" to your field ID.
add_filter( 'gform_field_content_123_6', function ( $field_content, $field ) {
	if ( $field->is_entry_detail() ) {
		$field_content = '';
	}
	return $field_content;
}, 10, 2 );