This gist is used in the tutorial https://www.vijayan.in/how-to-create-custom-table-list-in-wordpress-admin-page

drafts_table_menu.php

<?php
...
/**
 * Fires before the administration menu loads in the admin.
 */
add_action(
	'admin_menu',
	function() : void {
		add_menu_page(
			'All Drafts',
			'All Drafts',
			'manage_options',
			'all-drafts',
			__NAMESPACE__ . '\bootload_drafts_table',
			'dashicons-edit-page',
			100
		);
	}
);
...