Remove Gravity forms fields in a specific form

functions.php

// Robin Scott added this here for use in SiliconDales.com, but the snippet comes from Gravity Forms docs, here: https://docs.gravityforms.com/gform_export_fields/
add_filter( 'gform_export_fields', function ( $form ) {
    // only limit the fields available for export form form ID 3
    if ( $form['id'] == 3 ) {
        // array of field IDs I never want to see on the export page
        $fields_to_remove = array(
            'payment_amount',
            'payment_date',
            'payment_status',
            'transaction_id',
            'user_agent',
            'ip',
            'post_id'
        );
 
        foreach ( $form['fields'] as $key => $field ) {
            $field_id = is_object( $field ) ? $field->id : $field['id'];
            if ( in_array( $field_id, $fields_to_remove ) ) {
                unset ( $form['fields'][ $key ] );
            }
        }
    }
 
    // always return the form
    return $form;
} );