The UFW has a GUI front end that you can add to it to provide an “easier” method of working with the firewall. You will see that it will be installed and available using System/Adminstration/Firewall administration. The interface is set up for several different options. The “Current Configuration” has a default deny on all incoming traffic which should be a standard choice for all Desktop situations. You can see that the firewall is enabled. You have three tabs to add rules to the firewall.