The Preset Indicators are used by the Generator when composes new strategies.

When the Generator's option “The strategies use Preset Indicators” is enabled, each newly generated strategy starts with the preset indicators.

If you use the Reactor with Optimization on, it first composes new strategies with the corresponding Preset Indicators, but it is possible the Optimizer to change their numeric parameters. This happens when the “Optimize Preset Indicators” option is enabled.