Box {
  var showButton = remember { mutableStateOf(false) }
  ComposableWithRow(
    onScrollStateChange = { isScrolling -> showButton = isScrolling }
  )
  if (showButton) Button()
}

fun ComposableWithRow(
  onScrollStateChange: (isScrolling: Boolean) -> Unit
) {
  Box {
    Box {
        val listState = rememberLazyListState()
        listState.isScrollInProgress // HOW TO USE?

        LazyRow(state = listState)
    }
  }
}

onScrollStateChange

State<Boolean>

ComposableWithRow