You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <allpages gapcontinue="Tela_de_controle_de_visitas" />
  </query-continue>
  <query>
    <pages>
      <page pageid="3691" ns="0" title="Tela de Dashboard do sistema" contentmodel="wikitext" pagelanguage="pt-br" touched="2021-03-29T15:05:56Z" lastrevid="8104" counter="703" length="423" />
      <page pageid="713" ns="0" title="Tela de Vendas" contentmodel="wikitext" pagelanguage="pt-br" touched="2017-09-04T14:14:53Z" lastrevid="1856" counter="1192" length="1157" new="" />
      <page pageid="3630" ns="0" title="Tela de consulta do relatório de vendas do sistema da empresa" contentmodel="wikitext" pagelanguage="pt-br" touched="2021-02-17T18:31:52Z" lastrevid="7992" counter="588" length="911" />
      <page pageid="3646" ns="0" title="Tela de consulta últimos produtos" contentmodel="wikitext" pagelanguage="pt-br" touched="2021-02-24T17:38:32Z" lastrevid="8014" counter="695" length="587" />
    </pages>
  </query>
</api>