Termination of Wfbm, basic security?

Just out of curiosity… What happens if a disabled person (e.g., someone with a mental illness) works in a sheltered workshop and quits? Does quitting on their own affect basic social security benefits, so that in the worst case scenario, they could, for example, lose their apartment? Are there sanctions similar to those at the job center if they quit their "job"? And what about the job search? Does anyone know anything about this?

As I said, I'm asking out of curiosity.