Mo. R. Civ. P. 55.29
As amended through November 19, 2024
All trials upon the merits shall be conducted in open court and so far as convenient in a regular courtroom. All other acts or proceedings may be done or conducted by a judge in chambers, without the attendance of the clerk or other court officials, and at any place either within or without the county where the action is pending, but no trial or evidentiary hearing, other than an authorized ex parte hearing, shall be conducted outside the county where the case is pending without the consent of all parties affected thereby.
Mo. R. Civ. P. 55.29