The court of appeals has supervisory authority over all actions and proceedings in all courts except the supreme court.
Wis. Stat. § 752.02
The court of appeals is authorized to exercise its supervisory authority over a chief judge who is ruling on a substitution request. James L.J. v. Walworth County Circuit Court, 200 Wis. 2d 496, 546 N.W.2d 460 (1996), 94-2043.