Rename Unreal project

Basically:

  1. Change .uproject File Name
  2. Open the Config ‘DefaultEngine.ini’
  3. Change Project Name under [URL]
    GameName=ProjectName — if you dont see this line then add it yourself

See this link for more details https://www.worldofleveldesign.com/categories/ue4/ue4-renaming-your-project.php