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5.5. Changing the Format of User Names Displayed by SSSD

By default, SSSD uses the user_name@domain_name format when displaying user names. Before you change the format, see Section, “Supported User Name Formats” to learn about the reason of this default value.
To configure that SSSD displays only the user name without domain:
  1. Add the following entry to the domain's section in the /etc/sssd/sssd.conf file:
    full_name_format = %1$s
  2. Restart SSSD:
    # systemctl restart sssd