The investment amount which becomes the subject of trading is the base currency balance in your exchange account. (For example, USDT for Binance)
Since it automatically updates the balance subject to the trading, nothing needs to be done when you increase or decrease the balance in the exchange. However, it might take a while depending on the situation.
Though it may take a while, the bot will update the current balance before making any orders. So you do not have to worry about it.