OnionTrafficOnly + Whonix-Gateway

I am trying to configure my whonix-gateway instance so it only can access to onion sites
Reading the tor doc I found there is a flag: OnionTrafficOnly
My question is, do I have to set that flag for every SocksPort on the tor-service-defaults-torrc file?

Thanks in advance

https://www.whonix.org/wiki/Free_Support_Principle applies.

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