Wtone, welcome to the forum. You'll find this forum to be invaluable as you start to explore all the features of your new ID.4.
The fan noise coming from the front of your ID.4 is normal. As far as I can tell, it always comes on when you're charging your vehicle, regardless of which charger you chose. It's not as noticeable when you're outside because of the ambient noise; more noticeable in the garage because it's so much quieter.
When you start a charging routine, you'll hear a "click" coming from somewhere in the car, followed by your infotainment system displaying your charging status. Soon thereafter, you'll hear the fan come on which heats or cools the battery during charging. I might also recommend that you start the Car-net app on your smartphone so that you can remotely monitor the charging process.