It is now always at the bottom. I use this for adding subtitles. Sometimes the focus of the video is on the botoom of the screen. The subtitles are than blocking the view. In that case you would likt ot temporarely move the Capton to the top of the screen.
I personally would like to see that smart player provides this functionally soon, similarly to the YouTube player (although their implementation is not great either as the position resets after each caption).