Hi Malik,
You can always set a startup view from the user interface without touching the config file. Zoom to the target extent, open application Settings, click Take snapshot. The camera info will be written to your user's config.xml automatically, and ArcGIS Earth zooms to the exact view you specified the next time you launch it.
Moreover, the startup view is available in both user's config.xml (for example, C:\Users\username\AppData\Local\Programs\ArcGIS\Earth\bin) and administrator's config.xml (for example, C:\Program Files\ArcGIS\Earth\bin). When a user has set a startup view in user's config.xml, ArcGIS Earth always honors user's habit/behavior in the first place.
To override user's values with admin's values, you can click Reset in application Settings, then ArcGIS Earth is reverted back to honor admin's config settings the next time you launch it.
Thanks,
Mandy