Okla. Stat. tit. 12, § 1148.7

A jury trial shall only be an option for claims for the collection of rent or damages to the premises, or claims arising under the Oklahoma Residential Landlord and Tenant Act, and shall not be an option for forcible entry and detention actions. For suits with actions for the forcible entry and detention, or detention only, of real property, along with claims for the collection of rent or damages to the premises, or claims arising under the Oklahoma Residential Landlord and Tenant Act, and a jury trial is requested, the suit for forcible entry and detention shall be severed from the other claims in the suit and shall have its own non-jury trial. For suits where a jury trial is an option, if neither party demands a jury trial on or before the day of trial, the court shall try the cause.