Remove Gutenberg on pages

admin.php

class Admin {

    function __construct() {

		// Gutenberg
    	add_action( 'current_screen', array( $this, 'clean_page_gutenberg' ) );
        
	}
    

    /*
        Disable Gutenberg on pages
    */

    function clean_page_gutenberg() {

        $current_screen = get_current_screen();
        $current_post_type = $current_screen->post_type;

        // Check if post type is page
        if( $current_post_type == 'page' ){

            $this->gutenberg_removal();

        }

    }


    /*
        Gutenberg Removal
    */

    private function gutenberg_removal() {

        remove_filter( 'replace_editor', 'gutenberg_init' );
        remove_action( 'load-post.php', 'gutenberg_intercept_edit_post' );
        remove_action( 'load-post-new.php', 'gutenberg_intercept_post_new' );
        remove_action( 'admin_init', 'gutenberg_add_edit_link_filters' );
        remove_filter( 'admin_url', 'gutenberg_modify_add_new_button_url' );
        remove_action( 'admin_print_scripts-edit.php', 'gutenberg_replace_default_add_new_button' );
        remove_action( 'admin_enqueue_scripts', 'gutenberg_editor_scripts_and_styles' );
        remove_filter( 'screen_options_show_screen', '__return_false' );

    }
    
}