A Phase 3, Multicenter, Randomized, Platform Study of p19 Inhibition of the IL-23 Pathway to Establish Efficacy in Pediatric Crohn's Disease

Inclusion Criteria: * Participants must have a diagnosis of Crohn's Disease (CD) or fistulizing CD, with active colitis, ileitis, or ileocolitis, confirmed at any time in the past by clinical, endoscopic, and histologic criteria. * Participants must have moderately to severely active CD (as defined by a baseline Pediatric Crohn's Disease Activity Index \[PCDAI\] score greater than or equal to \[\>=\] 30) * Participants must have endoscopy with evidence of active CD defined as Simple Endoscopic Score for Crohn's Disease (SES-CD) score greater than or equal to (\>=) 6 (or \>=4 for participants…