Blackmagic camera - android- settings questions

I am using the latest Blackmagic Camera app for Android on a Samsung Galaxy S24
1) I can't find a button to minimise or close the app. It can't be swiped away. I can't access any Samsung buttons on the bottom of the screen to turn off or minimise the app when it is running. What am I missing?
2) I can't find 16:9 frame recording size.
3) The app is stuck in portrait view - horizontal view cannot be selected.
Hopefully someone has some answers.
1) I can't find a button to minimise or close the app. It can't be swiped away. I can't access any Samsung buttons on the bottom of the screen to turn off or minimise the app when it is running. What am I missing?
2) I can't find 16:9 frame recording size.
3) The app is stuck in portrait view - horizontal view cannot be selected.
Hopefully someone has some answers.