Function offXRSessionStart

offXRSessionStart(fn: (evt: XRSessionEventArgs) => void): void
Remove a listener for when an XR session starts
Parameters
- fn: (evt: XRSessionEventArgs) => void
  The function to remove from the listeners
Returns void
Example
```
const myFunction = (evt) => {
 console.log("XR session started", evt);
};
onXRSessionStart(myFunction);
offXRSessionStart(myFunction);
```