To change the currently used PHP Version from the native version (Currently 7.4) you may follow as below.
1. Find the PHP Settings in your DirectAdmin interface under the Account Manager section.
2. The system will then show you the current Native PHP version if you have not customised this before.
3. Using the dropdown you can select a PHP version from PHP Version 5.6 through PHP Version 8.3
4. After clicking "Update Version" your custom PHP version is saved and will be used by the sites under your DirectAdmin account.