question

Any news on this? It seems a rather serious bug. According to the docs, when you use fullscreen mode, it should show a small "fullscreen handle": "Fullscreen mode, which hides the status bar and minimizes the soft key bar. Only a small "fullscreen handle" is displayed. Users can view both toolbars by tapping the fullscreen handle or swiping up from the bottom of the screen. The following example shows the flag for fullscreen mode [..]" However, since OS 4, it just goes into complete immersive mode, even though I don't use that setting anywhere...!

You are correct that Fire OS 4 has a full screen mode where overflow menu icon does not appear to make the soft key bar visible. But when the user launches the full screen app for first time in a device that has Fire OS 4.0 installed, there will be a native message displayed to guide them on how to use the soft bar. By default your app will not be in full screen mode. If you have used either of following in your app then app would be full screen. public class ActivityName extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); // remove title requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.main); } } Or via AndroidManifest.xml file: There is no API or settings provided in Fire OS 4 to keep your app in full screen and show the overflow button for navigation guide for the user.