Option to mirror or cast

[pspec]

Hi

 I use my s9 to cast to my 43" and 65" samsung Tv. When connecting with smart view, by the TV you want to select there used to be a drop down were you could choose to mirror or cast. 

The cast option vanished on the 65" months ago now it's gone on the 43" and I only have the option to mirror on both tvs. .

Anyone know why or how to get it back. 

Thanks 

[LukeSammut]

I've had something similar but recently I've lost the ability to mirror using the smart view.