How to set which world the portal in nether takes you to?

Hello, I have two overworlds, one is our old "world" which we never use. We created a new world for 1.20 called "world2", but when players make a nether portal in the new world and then try to go back into the portal to go home, it teleports them to the same coords but in "world", how can I change which world players are teleported to when coming back from the nether? I use multiverse for multiple worlds.
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