SL and Profit taking in Streak

Am confused with The “Stop-Loss” and “Take Profit” % levels

Suppose I want 2.5% Loss and 3.5% Profit.

What does Streak calculate based upon?

Capital Engaged or Value of the Underlying, going up and down.

Meaning upon 3% on Cap, positions will be Exited OR Deductions of 2.5% will result in SL being hit.

Pls, advice!. Thank You.