You cannot hide your trades from your broker, although not showing your Stop Loss and Take Profit value to broker is fairly easy no matter what trading platform you are using. Simply you just do not set SL/TP values and no one will see it. Broker will not know about it and you can manually close the trade whenever you want. Broker will not know where your stop loss level is and they will not be able to “hunt” it. However, you won’t be able to watch after your trades 24 hours a day.
Even if your account has millions of dollars, most brokers are not interested to know how you trade. Brokers have other better thing to do.