The Loading Screen System should work properly in VR out of the box, with the exception of the Screen Fade Component, which by default uses a UMG overlay for smooth fade effects. To work with VR the Fade Component has to be set to utilize the PlayerCameraManager class.
In order to use this option set “Use CameraManager (instead of UMG)” on the component to true.
You can further set the default color of the fade effect as well as have Audio also faded out automatically.
Level Streaming is required. You can use multiple persistent levels and transition between those with the standard OpenLevel node, but each level still needs to stream in the transition map and actual game level with your content.