PHP-FPM user

Hi, recently updated a big website to use PHP 7.4 (from 5.6 previously - yes it was a lot of work!) and enabled PHP-FPM. Previously, my site was running as the 'nobody' user with very restricted permissions but now I'm noticing PHP is running as a different user (account holder) who has different permissions, and possibly more than required by a visitor to the website. I just wondered if it's possible to change the PHP-FPM service to run under a different (original) user?