Ok so there is definitely a bug in Unity3D but found a work around. The BUG: For some reason when trying to use the UI to add that Cosmos profile it borks the "Open XR Package Settings.asset" file causing duplicate entries in that file etc. The workaround: * Delete the "Open XR Package Settings.asset" file if its messed up. * Use VS-Code & find "nameUi: HTC Vive Cosmos Controller Support" * Set "m_enabled: 1" to enable it. * Save file & go back to Unity3D then re-open your settings window. * You can now normally add back your other profiles.