Index.php

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<?php
namespace Magento\Cms\Controller\Adminhtml\Page;

use Magento\Framework\App\Action\HttpGetActionInterface as HttpGetActionInterface;
use Magento\Backend\App\Action\Context;
use Magento\Framework\View\Result\PageFactory;

class Index extends \Magento\Backend\App\Action implements HttpGetActionInterface
{
    const ADMIN_RESOURCE = 'Magento_Cms::page';

    protected $resultPageFactory;

    public function __construct(
        Context $context,
        PageFactory $resultPageFactory
    ) {
        parent::__construct($context);
        $this->resultPageFactory = $resultPageFactory;
    }

    public function execute()
    {
        $resultPage = $this->resultPageFactory->create();
        $resultPage->setActiveMenu('Magento_Cms::cms_page');
        $resultPage->addBreadcrumb(__('CMS'), __('CMS'));
        $resultPage->addBreadcrumb(__('Manage Pages'), __('Manage Pages'));
        $resultPage->getConfig()->getTitle()->prepend(__('Pages'));

        $dataPersistor = $this->_objectManager->get(\Magento\Framework\App\Request\DataPersistorInterface::class);
        $dataPersistor->clear('cms_page');

        return $resultPage;
    }
}