How to set an exit node in Wonix of QubesOS?

I use Whonix on QubesOS. And the following sentence was added at the end of “/ etc / tor / torrc” to change the exit node of Tor. And I checked the ip in TorBrowser, but the settings were not reflected. Also, after restarting, the edited file was restored. How can I set the exit node?
ExcludeNodes SlowServer, {gb}, {us}, {ca}, {au}, {nz}
StrictNodes 1

Tor question. Not Whonix question.

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

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