How to set what roles can block members and roles that cannot be block ?

1. How to set what roles can block member ?

1.1 Go to "Block Members" Settings Page.

1.2. You can set what roles can block other members from the section below :

2. How to set what roles cannot be blocked ?

2.1 Go to "Block Members" Settings Page.

2.2. You can set what roles cannot be blocked by other members from the section below :