How to make the SplashScreen full screen?

I buy RocketWeb from CodeCanyon, my splash screen is not full screen like RocketWeb play store app.

During configuration app from RocketWeb configure page. If you turn on full-screen mode as enable then it’s will be full screen automatically.

If you only want to make a splash as fullscreen. Then follow the image add and removed those lines. Add:

window.decorView.systemUiVisibility = (View.SYSTEM_UI_FLAG_LAYOUT_STABLE
        or View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
        or View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
        or View.SYSTEM_UI_FLAG_LOW_PROFILE
        or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar
        or View.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar
        or View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY)