Can I Manually Adjust the Weights in the Portfolio Optimizer to See How the Portfolio Performs?

No, the tool only works with 4 strategies at this time (maximize Sharpe ratio, minimize standard deviation, target return, target standard deviation) that automatically adjusts the weightings to achieve the desired output. However, you can click the ‘pencil’ icon on the portfolio to choose ‘minimum’ and/or ‘maximum’ weightings for the holdings in the portfolio if you'd like to set manual values.