A Study to Evaluate Efficacy of Remibrutinib Compared to Dupilumab at Early Timepoints in Adults With Chronic Spontaneous Urticaria Inadequately Controlled by Second Generation H1-antihistamines

Inclusion Criteria: * Adults ≥ 18 years of age at the time of signing the informed consent * CSU duration for ≥ 6 months prior to screening (defined as the onset of CSU determined by the Investigator based on all available supporting documentation) * Diagnosis of CSU inadequately controlled by sgH1-AH at the time of randomization, defined as: * The presence of itch and hives for ≥ 6 consecutive weeks prior to screening despite the use of sgH1-AH during the 7 days prior to randomization (Day 1): * UAS7 score (range, 0-42) ≥ 16, and * ISS7 score (range, 0-21) ≥ 6, and * HSS7 score (range, 0-21) ≥ 6 * Documentation of hives within 3 months before randomization (either at screening and/or at randomization); or documented in the participants medical history * Willing and able to complete an Urticaria Patient Daily Diary (UPDD) for the duration of the study and adhere to the study protocol * Participants must not have had more than one missing UPDD entry (either morning or evening) in the 7 days prior to randomization (Day 1) Exclusion Criteria: * Previous use of remibrutinib or other bruton's tyrosine kinase (BTK) inhibitors * Previous use of dupilumab * Evidence of clinically significant cardiovascular (such as but not limited to myocardial infarction, unstable ischemic heart disease, NYHA Class III/IV left ventricular failure, arrhythmia and uncontrolled hypertension within 12 months prior to Visit 1), neurological, psychiatric, pulmonary, renal, hepatic (past history or curr…