On Store Apps impossible to stop movie, when launched Handheld.PlayFullScreenMovie(). You have to wait till movie finishes to play.

Reproducible on 5.3, 5.4 versions.

Repro steps:
1. Open project "WSAFullscreenMovieNoExitButton.zip";
2. Build to WSA or UWP;
3. Build and run project on tablet.

Expected:
While playing movie, Esc or whatever other exit key should be detected to quit playing movie.
On Surface tablet in "tablet mode" back button should be able to stop playing movie.