All outbound connections can be forced through tor with onlynet=onion if i recall correctly

as to how you can check this, not sure.

Not sure how it works for inbound. probably best practice to disable all of it with nolisten.

Maybe check out:

https://bitcoin.stackexchange.com/questions/70069/how-can-i-setup-bitcoin-to-be-anonymous-with-tor/

And:

https://bitcoin.stackexchange.com/questions/103402/how-can-i-use-bitcoin-core-with-the-anonymous-network-protocol-i2p