There's more information about this in this unity forum post: forum.unity.com/threads/how-to-detect-if-headset-is-available-and-initialize-xr-only-if-true.927134/ The short answer is it's kinda difficult and subject to change based on which platform you're using, and honestly it's safer to just leave the XR Device Simulator off and then enable it when you need it.
is there no way to tell from code whether a headset is attached and dynamically enable/disable the device simulator?
There's more information about this in this unity forum post: forum.unity.com/threads/how-to-detect-if-headset-is-available-and-initialize-xr-only-if-true.927134/
The short answer is it's kinda difficult and subject to change based on which platform you're using, and honestly it's safer to just leave the XR Device Simulator off and then enable it when you need it.