Yes @DownToCode you are right, you are able to use VR preview with a good USB3 cable attach whilst running the Oculus desktop app.
[Using VRidge and Rifcat you can even potentially use it wirelessly, but you’d need a 5GB router for that! ]
In terms of stopping the notification of the lost tracking, you can prevent this by turning off Guardian mode in the headset, if the Quest is set in developer mode!
After that, you can turn of head tracking in the headset’s settings. This was a godsend as I’m currently working on a project where the headset’s sensors will be covered . .
~(Thanks to a long-awaited update that came last month (November) that allowed people to watch stuff in bed with lights off lol!)
Yeah @CaptParis000 make sure in the headset you accept the connection to the PC and accept Link (beta) and that your USB ports and wire is USB 3 , these things to ages for me. 