HELP ! Avast Beginner / Different Questions

Hey,
hope everybody is healthy and doing good.

I got the German Version of AVAST PREMIUM SECURITY ( ULTIMATE ) for Mac ( Version 14.9. ) …

I have several question, was looking on google ( and here ) for solutions but couldnt find one.

  1. When i go to my WLAN-Inspector, i can see devices which are connect to my WLAN. Can i block / kick them ?
    ( Or to allow that later again ? Just to check what kind of device / who it is … cause the description doesnt tell me anything about that )

  2. Do it have a detailled information-tab for my firewall ?
    Cause i see the description “FIREWALL” nowhere and i dont know if i can adjust some things in here …
    In my Version, i dont see “Firewall” anywhere …

Sorry for that - maybe - stupid questions, but i try to secure my mac as good as possible.

have a nice day and thank you very much.