If you need a different PHP version for your requirements, you can change it in the settings of the respective domain.
To do so, switch to the respective domain and click by Developer Tools on PHP Settings in the right column. Here you can also see the currently used PHP version. In our example the current PHP version is 8.0.28.
After you have selected this option, you can now easily set the required PHP version in the upper drop-down menu.
After selecting the PHP version, scroll all the way down and confirm your selection by clicking "Ok". Plesk will then restart the affected web server and provide you with the version you just selected.
These settings can be customized to be domain specific.