If you use a laptop or similar device with the Fn key on the keyboard, you may have to press Fn + F11 , instead of F11.
Ọ bụrụ na ị jiri laptọọpụ ma ọ bụ ngwaọrụ yiri ya na igodo Fn na keyboard, ị nwere ike ịpị Fn + F11 , kama F11.