How can I modify the initialized member value of UParticle System by using ClassDefaultObject when Particle system asset created

Development Asset Creation FX
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Hello guys,
How can I modify the initialized member value of UParticle System by using ClassDefaultObject when Particle system asset created. From the google I found that every types of object uses the CDO to initialize. So I want to modified the value in CDO. But when I new an asset the value was not modifed. But when I used cascad, I can reset the value to the default value which I set in the CDO by the button beside the value box. Could anybody Know what happened?

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Any Epic staff could explain if the asset object use the CDO when it is creating and initializing.