The little blue boxes on the left side of the inputs in the Strategy Tester are used for optimization.
When you check those boxes, MT4/MT5 will include that specific setting in the optimization process and test different values automatically based on the:
Start
Step
Stop
columns you set for that parameter.
Example:
If Risk is:
Start = 0.01
Step = 0.01
Stop = 0.05
then the tester will run multiple backtests using:
0.01 → 0.02 → 0.03 → 0.04 → 0.05
If the blue box is NOT checked, that setting stays fixed during the backtest.
These boxes are mainly used when trying to find the best-performing combinations automatically through optimization reports.
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