I have a question.
If I were to create an additional world on my server with the Multiverse Plugin and build a Nether Portal in this world, I would then come to the Nether of the normal world or to an additional Nether, e.g. The 2nd Nether?
Actually in the 2nd
OK thanks
It doesn't matter how many worlds you create and create a nether portal in them, you always come out in the same nether, just in a different place, since there's only one nether and one end.
Is there any way to change that?
No, if you were to create a second netherworld, the first one would be overwritten by it unless the world is on a second server, which you probably don't intend to do.