What occurs when a security profile group named “default” is created on an NGFW?

A security profile group named “default” is automatically applied to all new security rules unless a specific profile group is explicitly configured.

“If a security profile group named ‘default’ exists, it will be automatically applied to any newly created security policy rules to ensure consistent protection.”

(Source: Security Profile Groups)

This behavior ensures that newly created policies are always protected by default security profiles, minimizing human error.