CI4 what to use instead of db_select

With CI3 when I needed to change the database name and not the connection I could use:

PHP Code:

$this->db->db_select('DB_NAME'); 


How can I do the same thing in CI4?

$db->setDatabase($database2_name);
https://codeigniter4.github.io/userguide...etdatabase

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

$db->setDatabase($database2_name);
https://codeigniter4.github.io/userguide...etdatabase

Perfect, I missed it in the documentation, thanks