Disable ipv6 dhcp internally

[greywardens1]

I'm trying to use an internal dns and dhcp server(adguard), and the ipv6 dhcp won't disable on the cax80. Is there a new firmware that allows for this?  uPNP is on, and there is nowhere to turn off ipv6, just set it to dhcp or auto

[plemans]

On the combo devices, its the ISP that controls it. 

I've only found it on the router only devices where the user can manage it.