How to get rid of the black square at the edges of the world?

do u see this in simulation mode too or only in edit mode 

This looks like the edges of a transparent plane. SpaceGlitterUnicorn  any ideas?

I see it everywhere: in the editor and on my phone

No transparent plane in the scene. This is something we cannot remove because it's not an object.

Hi MResearch!

This looks to be a matter of the skydome tiles being misaligned. While skydomes are meant to be seamless, it's not impossible for them to have some seams to them when using the GenAI skydome feature. I have generated a skybox and as you can see I have a similar issue. I recommend one of the following:
1: Iterate on the skydome with GenAI until you have one that is satisfactory
2: Create custom skydomes for seamless results Original Documentation here, my companion guide here
3: Use the world to hide these seams as they tend to be located on the bottom of the skydome

I hope this helps! Happy creating!