A Study of Rozanolixizumab in Pediatric Study Participants With Moderate to Severe Generalized Myasthenia Gravis

Inclusion Criteria: * Study participant must be ≥2 to \<18 years of age inclusive, at the time of signing the informed consent/assent according to local regulation * Study participant must have a documented diagnosis of generalized Myasthenia Gravis (gMG) at Screening that includes a record confirming the presence of MG specific autoantibodies to acetylcholine receptor (AChR) or muscle-specific kinase (MuSK) prior to Screening * Study participant has Myasthenia Gravis Foundation of America (MGFA) Clinical Classification II to IVa at Screening * Study participant has received existing conventional treatment(s) for gMG (eg, pyridostigmine, corticosteroids, and/or immune suppressants) prior to Screening * Study participant has had an unsatisfactory clinical response or worsening of gMG symptoms and is in need of additional therapy (for example, plasma exchange (PEX) or treatment with intravenous immunoglobulin (IVIg)) Exclusion Criteria: * Study participant with severe weakness affecting oropharyngeal or respiratory muscles, or who has myasthenic crisis or impending crisis at Screening or Baseline * Study participant has a known hypersensitivity to any components of the Investigational Medicinal Product (IMP) or other anti-neonatal-Fc receptor (FcRn) medications * Study participant with any active or untreated thymoma * Study participant has a history of thymectomy within 6 months prior to Screening * Study participant has a clinically relevant active infection (eg, sepsis, p…