Open your Bundle and select Edit. Then choose the option to rebalance it and set the new percentages. The app will show you the orders needed to reach your new mix, which may include selling some stocks and buying others. Review the orders and fees, then confirm.
Please note that each purchase or sale in a rebalance must be at least USD 10 and has its own transaction fee. Selling stocks during a rebalance may result in a gain or a loss.