Plesk has two ways to configure Plesk: the build-in PHP menu and the PHP selector. Use this tutorial to use the PHP selector powered by CloudLinux to enjoy more flexibility with the enabled modules and more.
Unable to find the menu item? This option is by default not available. Usually, this option is only available after a migration. Note: it is possible that you'll need to select PHP version 8.0. Newer versions may not trigger CloudLinux. This is a known bug.