Looking for clarification of action.

I need to merge two authors that are actually the same person. One "author" name will be replaced by the other after having been merged. However, I don't know which one will remain and the internal documentation is not clear (as the screenshot below shows), and the online tutorial does not explain any of this.

This is my question: After merging, which "parameter" remains, the first or the second?

Yes, that's confusing.

The first parameter is 'From', and the second parameter is 'To'.

Thank you.
If I had the permissions, I would use my own time to add this information to the tutorials for you, but since I don't expect that this forum will serve as the next best thing.

I renamed the parameters to 'From' and 'To' when I saw your post (for v11).
Typically when I see something is too confusing I quickly tweak things as I work through it.

Excellent!
Thanks again.