The backtest output metric for Average Return per Trade should have a toggle to display % return instead of fixed $ return per Lot.

Here is an example of a scenario where this matters; one trade instance has a position lose 80% of its value, but this return is concealed by the 'average' $ return being positive. The average percent return in this case would be -3% (-30 basis points).

This can give a better view of long - term performance than CAGR (which is biased towards recent results) or fixed $ return per trade (which is biased towards performance in high volatility regimes).