Yes. At least one spouse must appear in court to finalize an uncontested divorce in Cook County, Illinois.
Most judges require the spouse who initiated the case (i.e. the Petitioner) be present to testify before the judge regarding the facts of the marriage and the terms of the settlement agreement. This court appearance is called a “Prove Up.” You can read more about prove ups here: https://www.esserlegal.com/prove-ups/
The other spouse must be given notice of the court date, but can choose not to appear.