x-powered-by

Hello, I use an Ubuntu 14.04.3 LTS Server with Plesk 12.5.30 Update #18. Is it possible to completly remove the X-Powered-By in the header? In the Plesk Panel I added for additional Apache HTTP commands: "Header unset X-Powered-By". This removed the "PleskLin" in the X-Powered-By. So the...