I noticed many stuffs are not perfectly mirrored (body, scarfs, head).
So it’s up to you to decide what’s symmetrical and what’s not.
My general advice would be to leave symmetrical to world, make sure the object is centered. (note that it’s usually like that in other software, and it’s the default in Nomad).
Here’s how you could do it, without merging.
Basically by selecting each object, resetting the symmetry line and reapplying mirroring.
