A Study to Evaluate the Efficacy and Safety of Rozanolixizumab in Adult Participants With Myelin Oligodendrocyte Glycoprotein (MOG) Antibody-associated Disease (MOGAD)

Inclusion Criteria: * Participant must be ≥18 to ≤89 years of age, at the time of signing the informed consent * Confirmed diagnosis of MOGAD consistent with published diagnostic criteria for MOGAD * Participant has history of relapsing MOGAD with at least 1 documented relapse over the last 12 months and a documented positive serum MOG Ab test using a cell-based assay (CBA) within 6 months prior to randomization * Participant must be clinically stable at the time of the Screening Visit and during the Screening Period Exclusion Criteria: * Participant has been diagnosed with a neurological autoimmune disease (including multiple sclerosis (MS) and aquaporin-4 positive neuromyelitis optica spectrum disorder (NMOSD)), or a systemic autoimmune disease that in the opinion of the investigator can interfere with the safety of the participant * Participant has a clinically important active infection (including unresolved or not adequately treated infection) as assessed by the investigator, including participants with a serious infection within 6 weeks prior to the first dose of the investigational medicinal product (IMP) * Participant has a current or medical history of primary immunodeficiency * Participant tests positive for aquaporin-4 antibodies at Screening * Participant has a serum total IgG level ≤ 5.5g/L