How should I delete the default participants(domain=0) in NDDS which version 6.1.0

I create the participant by new (dds::domain::DomainParticipant)(12);

I found that DDS created a participant with domain 0 by default ,Not what I expected;

How should I delete the default participants(domain=0) in NDDS which version 6.1.0

As shown in the figure