Andrew Z. answered 03/21/19
Experienced MFA Grad Teaching English, Literature and Writing
This depends entirely on the amount of liberty you've granted the editor. If the editor did not discuss with you the extent of editing that you require then that is pretty unprofessional. What I personally do as an editor is do a screening of spelling and grammatical errors which I rectify, then I run through the text looking for ways in which I can improve the expression of what the author intended to say. I realize that this is where the science ends and art begins, so it is important for me to communicate with the author when I reach this stage. If the editor is simply rewriting your work without contacting you about the drastic changes to structure and voice, then I would have a serious talk with them.