With this code y solve my problem to cannonical tag in index. This code it´s setted in folder_theme/_partials_head.tpl:
{if $page.canonical} <link rel="canonical" href="{$page.canonical}"> {elseif $page.page_name == 'index'} <link rel="canonical" href="https://{$smarty.server.HTTP_HOST}/"> {/if}