Video Control staying on to screen

I have just started using Plex. My sever is a windows 10 pc and I am playing the videos on a LG OLED65E6V.
However the controls, skip back, pause, play, skip Fred, etc remain on the screen with the picture visible through them.
There is also a transparent band across the top of the screen
I can see no setting to remove these, am I missing something?