I have a pi3, pi camera and kookye 3.5"lCD. On power up the OS is displayed on the 3.5 screen and the touchscreen works fine. When I run the camera it doesn't out put to the 3.5lcd. Likewise when I play video it doesn't output to 3.5lcd. When I attach HDMI the OS is still displayed on the 3.5lcd however the video and camera output are shown on the HDMI.
How do I change the camera and video output to display on 3.5lcd.
I'm new to raspberry so explanation will have to be simple. Any help appreciated.