Who is entitled to a jury trial? You must make the request right away.Otherwise, the party waives a jury. The Supreme Court Commission on Access to Justice has approved the following forms. All Illinois Courts must accept these forms. The Illinois Supreme Court mandated Cook County to Utilize the Statewide Electronic Filing System (eFileIL) for Civil Case Filings in Cook County. So far as the constitution is concerned, the jury must be one of 12 members in civil cases unless the parties otherwise agree. This adversely affects the defense bar in Illinois. All probate courts prefer that their own forms be used. Or visit their website to find out how to do this.