@Composable
fun Testing() = Column {

    val tabIndex = remember { mutableStateOf(0) }

    Row {
        Button(onClick = {
            tabIndex.value = tabIndex.value - 1
        }) { Text("Previous tab") }
        Button(onClick = {
            tabIndex.value = tabIndex.value + 1
        }) { Text("Next tab") }
    }

    if (tabIndex.value % 2 == 0) {
        ContentForTab1(1)
    } else {
        ContentForTab2(2)
    }
}

@Composable
fun ContentForTab1(tabIndex: Int) {
    ScrollableColumn {
        (0..100).map { Text("Item in tab: $tabIndex number $it") }
    }
}

@Composable
fun ContentForTab2(tabIndex: Int) {
    ScrollableColumn {
        (0..100).map { Text("Item in tab: $tabIndex number $it") }
    }
}