Creating your own preset
Make your own Material Instance and change presets at runtime.
- Right-click
M_Kuwahara_Masterand choose Create Material Instance. - Enable the parameters you want to change and set your values.
- Assign the new instance in your Post Process Volume.

Changing presets at runtime
Create a Dynamic Material Instance in Blueprint, assign it to the Post Process Volume's settings, and set scalar/vector parameters on it.
Static Switches cannot change at runtime. Use separate instances for different module combinations.