Widget_Sidebar::_register_controls

		$default_key = array_shift( $default_key );

		$this->start_controls_section(
			'section_sidebar',
			[
				'label' => __( 'Sidebar', 'elementor' ),
			]
		);

		$this->add_control( 'sidebar', [
			'label' => __( 'Choose Sidebar', 'elementor' ),
			'type' => Controls_Manager::SELECT,
			'default' => $default_key,
			'options' => $options,
		] );

		$this->end_controls_section();
	}

	/**
	 * Render sidebar widget output on the frontend.
	 *
	 * Written in PHP and used to generate the final HTML.
	 *
	 * @since 1.0.0
	 * @access protected
	 */
	protected function render() {
		$sidebar = $this->get_settings_for_display( 'sidebar' );

		if ( empty( $sidebar ) ) {
			return;
		}