How to change TemplateVM update method from Whonix to just another appvm?

[Sphere]

So upon installation of Qubes I have set updating of TemplateVMs through Whonix but now I'm actually stuck with it and I want to change it to updating through just another AppVM.

Could anyone guide me to what commands I need to use in order to fix this? (I actually wish this was an option in Qubes settings UI as well)

[Patrick Schleizer]

Sphere:

> So upon installation of Qubes I have set updating of TemplateVMs through Whonix but now I'm actually stuck with it and I want to change it to updating through just another AppVM.
>
> Could anyone guide me to what commands I need to use in order to fix this? (I actually wish this was an option in Qubes settings UI as well)
>

Qubes R4?

modify:

/etc/qubes-rpc/policy/qubes.UpdatesProxy

[Sphere]

Thank you