这可以通过将参数传递给父窗口小部件构造函数的$control\\u选项来设置，这是第四个参数。下面是一个示例构造函数：

class Custom_Widget extends WP_Widget {

    /**
     * Sets up the widgets name etc
     */
    function __construct() {

        $widget_options = array(
                \'description\' => __( \'Featured Pages Widget.\', \'affiliate\' )
        );

        $control_options = array(
                \'width\'  => 750
        );

        parent::__construct(
            \'custom_widget\', // Base ID
            __( \'Custom Widget\', \'text_domain\' ), // Name
            $widget_options,
            $control_options
        );
    }