Simple classes support?

[CryptoCashCashoo]

Array items made of simple classes doesn't fold:

[System.Serializable]
public class Player
{
	[Foldout("DATA OBJECT", true)] 
	public int hp;
	public int attack = 20;
	[Foldout("DATA ATTACK")] 
	public int AT;
}

public class PlayerManager : Monobehaviour 
{
       public List<Player> _Players;
}