How to create rounded border Button using Jetpack Compose

To achieve a button with a border with rounded corners you can use the OutlinedButton component applying in the shape parameter a RoundedCornerShape:

OutlinedButton(
    onClick = { },
    border = BorderStroke(1.dp, Color.Red),
    shape = RoundedCornerShape(50), // = 50% percent
                                    // or shape = CircleShape
    colors = ButtonDefaults.outlinedButtonColors(contentColor = Color.Red)
){
    Text( text = "Save" )
}

It works with M2 and M3.