Avast ONE - Firewall configuration

Dear forum,
my mac blocks connection from outside, and I assume, that avast-on firewall “looks after my security”.
but I can’t find a firewall “bullet-point” to check/modify the firewall settings.
Support repeats claiming “Um auf die Firewall-Einstellungen in Avast One zuzugreifen, gehen Sie zu Erkunden ▸ Firewall ▸ Firewall öffnen.”
… but there is NO such point.

any ideas?
thanks in advance
jürgen