What are Account keys on Proton Mail?

Hi everyone.

I’ve been configuring my ProtonMail account. And added my PGP keys for email signing.
So far all good.

But then, I’ve seen another section called Account keys. Which I just ignore what they are. Also, I’ve looked into Key management | Proton and there’s no single definition of what those are.

I understand that they are likely the keys that correspond to all my account-related services. But I feel quite uncomfortable having to trust these keys that were “given” to me. Also wonder why I simply can’t import my keys and substitute them.

Has anyone else found this and questioned the same?