If your 2018 model has the Lippert Schwintek mechanism you might want to leave it retracted until you can visit an expert service department. Give Google a shot, but unfortunately you might find no easy answers.
Last spring we camped next to a new Forest River class A with an inoperable Schwintek full wall slideout. After 3 days it was still sitting on jack stands fully extended but severely tilted because the mobile rv service techs had NEI (no earthly idea) how to fix it.