newsupernova/app/code/Smartwave/Porto/Model/Config/Settings/Page/Layout.php

<?php
namespace Smartwave\Porto\Model\Config\Settings\Page;

class Layout implements \Magento\Framework\Option\ArrayInterface
{
    public function toOptionArray()
    {
        return [['value' => '1column', 'label' => __('1 Column')], ['value' => '2columns-left', 'label' => __('2 Columns with Left Sidebar')], ['value' => '2columns-right', 'label' => __('2 Columns with Right Sidebar')], ['value' => '3columns', 'label' => __('3 Columns')]];
    }

    public function toArray()
    {
        return ['1column' => __('1 Column'), '2columns-left' => __('2 Columns with Left Sidebar'), '2columns-right' => __('2 Columns with Right Sidebar'), '3columns' => __('3 Columns')];
    }
}