Add option in settings page in elementor

class ElementsKit_Extend_Onepage_Scroll{

    public function __construct() {
//		add_action( 'elementor/element/wp-post/document_settings/after_section_start', [ $this, 'register_controls' ], 10, 2 );
        add_action( 'elementor/element/wp-post/document_settings/before_section_end', [ $this, 'register_controls' ], 10, 2 );


	}

	public function register_controls( Controls_Stack $element ) {
        $element->add_control(
            'onepagescroll',
            [
                'label' => __( 'Onepage scroll', 'your-plugin' ),
                'type' => \Elementor\Controls_Manager::SWITCHER,
                'default' => '',
                'label_on' => __( 'On', 'your-plugin' ),
                'label_off' => __( 'Off', 'your-plugin' ),
                'return_value' => 'on',
            ]
        );

	}


}