Every time I open a pull request, in the reviewer option, a user appears that I don't know, I've looked everywhere and I don't know where to find him to remove from the project's reviewer
His name is Artur Rodrigues.
Welcome to the community.
Would it be possible for you to check if the user is added as a default reviewer under your Repository settings or Project settings?
To check under your repository settings:
To check under your project settings:
Let me know how it goes.