I cannot change the extension, I cannot see the changes after removing the code.
Pirat I didn't got you brother/
Pirat Try this:
php flarum cache:clear
brother, i tried it even does not work
Pirat what does "removing the code" mean? You need to remove the extension in question from your composer.json and then update your installation. Then clear cache. A more comprehensive guide can be found here: https://docs.flarum.org/extensions.html#uninstalling-extensions