IPv6 Custom Firewall Settings ARRIS TG1682G From Xfinity

Before I dig in does anyone have any advice for me on how to set the 'Custom' Firewall Settings for IPv6?  I did not even click on it in fear of messing something up.  I did just set IPv4 to 'Maximum Security' also, so wanted to wait and see if it causes me any issues before diving into IPv6 Custom Settings.

Thanks, pc