Most of the Bosch levels let you switch off the self leveling feature. It’s kinda clunky though, you slide the switch to a position that prevents the mechanism from swinging so you might throw it off in the process. Cycle to the plumb line then set the level on a level surface and let it settle. Then slide the switch to lock it when you move the level to wherever you want and it should make a “plumb” line that is square to where you place the level.