Looks great!

One thing though:
Do we really need to use a constraint layout and can't just add a normal row/column where one component uses Modifier.weight(1f)?
In my opinion we should try to keep things simple, and the new dependency is not really needed in my eyes.

So I'd just replace the constraintAs modifier and use a Row for landscape and a Column for portrait instead of a Box in ResponsiveRecordScreenLayout.

My initial plan was to do it like that. But Thought of using constraint layout for better flexibility.
I too think thats a bit overkill for this simple scenario.