Voronoi Split Screen problems

I’m trying to replicate a screen effect like the linked one and I’m coming across some problems:

  1. How do you manage to make the screens blend in while getting closer? Mine just look like they only get closer when distance is 0, and don’t even work for differences on the z axis (camera points to the xz plane).
  2. How can you make it work on a minimized viewport (like the editor one) as opposed to fullscreen all the time? I think there should be a way, but I can’t make it happen.

Thanks in advance.