What is PureOS Byzantium's default firewall and rules?

Interesting enough I looked through “apt list --installed”… nftables is no where to be found. it is NOT the default firewall. I did however find iptables within the list.

Is there a difference in kernel and OS versions between PureOS as a linux distro for normal desktop/laptop use (Byzantium) vs what the Librem5 phone uses? I’m specifically talking about Byzantium which is the .iso available for download for PC use.

unfortunately according to the list-rules command iptables by default doest not look like it deny’s any incoming traffic:

$ sudo iptables --list-rules
-P INPUT ACCEPT
-P FORWARD ACCEPT
-P OUTPUT ACCEPT

What gui do you guys recommend for IPtables? I have to research CLI commands to change these rules as the --help is a little to vague for me to know how to set it up as a simple firewall

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