How to stop Network Intelligence Center related SKUs?

[JYCHEN]

Hello everyone,

I found the following two skus on my bill:
(1) Network Intelligence Center Network Analyzer Resource Hours (9BF8-CD36-F9B8)
(2) Network Intelligence Center Topology and Google Cloud Performance Resource Hours (D9AD-28F8-05D8)

But I didn't actively enable related services.
I want to know why these services are enabled, and how to stop using these SKUs and billing.
(I found out that these billings are currently discounted. So I don't actually have to pay for them, But I still want to know how to stop these SKUs)

Thanks for your help!