Torrc file missing


I have installed Umbrel in a Gigabyte Brix. It works fine and channels are active but I have noticed that torrc is missing as I wanted to change the NumEntryGuards to 8 as some suggest it makes Tor more stable.

How is it possible that in ~/umbrel/Tor , all I have is this

Data run torrc-proxy torrc-server BUT no torrc file ?

Thank you