How to Hide WebToffee WP Backup and Migration Admin Menus

function plt_hide_wp_migration_duplicator_menus() {
	//Hide "WordPress Migration".
	remove_menu_page('wp-migration-duplicator');
	//Hide "WordPress Migration → Backup & Migration".
	remove_submenu_page('wp-migration-duplicator', 'wp-migration-duplicator');
	//Hide "WordPress Migration → Settings".
	remove_submenu_page('wp-migration-duplicator', 'wp-migration-duplicator-settings');
	//Hide "WordPress Migration → Logs".
	remove_submenu_page('wp-migration-duplicator', 'wp-migration-duplicator-log');
}

add_action('admin_menu', 'plt_hide_wp_migration_duplicator_menus', 13);

Where do I put this code?