I need to show a button below tabs in Jetpack Compose (Android, Kotlin)I have a screen like so, but the button os not shown up.

@Composable
fun MainScreen() {
    var tabIndex by remember { mutableStateOf(0) }
    val tabs = listOf("Accounts", "Documents")
    Column(modifier = Modifier.fillMaxWidth()) {
        TabRow(selectedTabIndex = tabIndex) {
            tabs.forEachIndexed { index, title ->
                Tab(text = { Text(title) },
                    selected = tabIndex == index,
                    onClick = { tabIndex = index },
                )
            }
        }
        when (tabIndex) {
            0 -> AccountsScreen()
            1 -> DocumentsScreen()
        }
        Spacer(modifier = Modifier.weight(1f)) // Pushes the button to the bottom

        Button(
            onClick = { /*TODO*/ },
            modifier = Modifier
                .fillMaxWidth()
                .padding(16.dp)
        ) {
            Text("Change Master Password")
        }
    }
}