Okla. Stat. tit. 12, § 12-591: Waiver of jury

The trial by jury may be waived by the parties, in actions

arising on contract, and with the assent of the court in other

actions, in the following manner: By the consent of the party

appearing, when the other party fails to appear at the trial by

himself or attorney. By written consent, in person or by attorney,

filed with the clerk. By oral consent, in open court, entered on

the journal.