Closing a job takes it off the working roster
Closed means done. When you set a job's execution stage to Closed, on the job itself or by selecting finished jobs on the roster and choosing Close, the job leaves execution. If its substantial-completion date plus the contract's warranty period (12 months when the contract doesn't say) hasn't passed yet, it goes into warranty. Otherwise it's closed.
Changed your mind? Move the stage back off Closed and the job returns to execution.
Finding finished jobs. The roster's toggle is now called Closed: Finished, so it doesn't get mixed up with Closed Lost. It's off by default. Turn it on to see every finished job, including ones in warranty.