§1. A novice can freely leave an institute; moreover, the competent authority of the institute can dismiss a novice.
§2. At the end of the novitiate, if judged suitable, a novice is to be admitted to temporary profession; otherwise the novice is to be dismissed. If there is doubt about the suitability of a novice, the major superior can extend the time of probation according to the norm of proper law, but not beyond six months. Art. 3.
Source: Code of Canon Law (Vatican.va)