An ability to setup two (or more) independent worlds/scenes/levels

Hello!

I need to do 2 things.

  1. Render a 3d widget in it’s own environment and display it as a part of GUI. Is there a way of doing that. Here is what it looks like in a different game engine: image (a nav. ball in the lower right corner).

  2. Have an ability to have two (or more) completely independent worlds/levels/scenes. (For example, one scene is on Earth and the other is on Mars or in a different “dimension”). But I need to process both simultaneously and allow players transitioning from one to another.

For the thing #1 the closest thing I was able to find is “Scene Capture 2D”. But I can’t figure out how to set up an independent world/level for it to capture.

For the thing #2 it is basically the same problem. I need to set up an independent world. It is trivial in the current game engine I use. But I can’t figure out the way of doing the same thing in Unreal.

I’d appreciate any recommendations!

Thank you in advance!