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I want to set the world arg in master so that if I don't specify it, it will take the default in the child files.

Ok, so have a default in the parent file, lets continue...

However, the child defaults within each file are different, as you can see (world1 and world2).

Why not remove defaults entirely from the child launch files so they have no default options?

How can i achieve this by replacing ????? ?

Your options are to remove the defaults so they always take the parent's default (or given), or you have to homologate these yourself and make sure they're in sync.