Use the lift, go in and out and go up and down using the stairs! Press <- and -> keys at the same time to force open the lift doors so the elevator can break safety and get stopped for safety purposes, until releveling towards the nearest floor.
Thanks to halfai93294 for the original project Lift-Sim 2021 - Diamond Lifts Luna. Thanks to Jon5432 for the original project Lift-Sim 2018 - Otis Gen2 Edition.