Padding in text doesn't add to the spacing, so I discard the use of title and load a custom title in text instead.
AlertDialog( modifier = Modifier.fillMaxWidth(), onDismissRequest = { onDismiss() }, /* // discard title usage title = { if (!title.isNullOrEmpty()) { Text(title) } }, */ text = { Column ( modifier = Modifier .fillMaxWidth() .padding(8.dp), // horizontalAlignment = Alignment.CenterHorizontally ) { // create custom title if (!title.isNullOrEmpty()) { Text(title, modifier = Modifier.padding(vertical = 8.dp), style = MaterialTheme.typography.subtitle1) } ProgressBar(modifier = Modifier .height(16.dp) .fillMaxWidth(), progress = progress) } }, buttons = { })NOTE: Stefano mentioned this problem is solved in Material 3, but I have yet to try it.