It is good to hear that you are loving it. Thanks for choosing Stockalyze.
Draw down is how far below the stock has come down from it's peak. For the same reason why maximum loss has to be in percentage this too has to be in percentage. If it is not in percentage then absolute value e.g. $5 will not make sense for different stocks that trade at $10 and $500.
Your trading systems we be safe as long as you don't uninstall Stockalyze.
Let me know if you have any more questions.