Screen window just got smaller

[AC Question]

Dont know how I did it but whilst on Facebook my screen has just reduced in size( so it's like picture in picture) It's easy to sort out but don't know how I did it ?

 

[kortino]

No idea, but I have had a lot of trouble with fb app and I am not using it anymore. If this happens with fb app only, you should report it to them.

 

[chanchan05]

On the S7/S7Edge/Note7? Like this:

That's the pop up view on new Samsung phones. You get that by dragging diagonally on one of the upper corners. I usually turn the feature off though.