def METHOD_NAME():
    """Set default user."""
    env_dict = read_env()
    credentials = load_dict_to_model(env_dict, CredentialsModel)
    preferences = load_dict_to_model(env_dict, PreferencesModel)
    sources = load_file_to_model(Path(__preferences.USER_DATA_SOURCES_FILE))
    profile = ProfileModel()
    default_user = UserModel(  # type: ignore
        credentials=credentials,
        preferences=preferences,
        profile=profile,
        sources=sources,
    )
    set_current_user(default_user)