Sequential Optimization in Cross-Check function does have some function as the Sequential Optimization on the Optimizer tab, describes here:
(link to Funtions -> Optimization -> Sequential Optimization)

Cross-Check Usage

Sequential Optimization can be used as a robustness cross-check, where the optimizer:

• Attempts to optimize each parameter using sequential logic
• Fails the strategy if too few stable regions are found
• Evaluates the robustness and parameter sensitivity of the strategy

This helps filter out strategies that rely on fragile or narrowly optimized parameter sets.

Dependency on Original Parameter Values

Note that sequential optimization is order-dependent:

• Each step uses previously optimized values
• Optimization result may vary if initial parameter values are changed

Best practice: Use reasonable defaults for initial values or run the process multiple times with varied starting points for better statistical confidence.