Inclusion Criteria:  Participant has sufficient visual acuity without the use of eyeglasses (contact lens use is acceptable) to accurately assess their facial lines, in the opinion of the investigator. Participant has moderate or severe GL at maximum frown.  Exclusion Criteria:  History of known immunization to any botulinum toxin serotype. History of known hypersensitivity to any botulinum toxin serotype, or any other constituents of the study drug or its excipients, and/or other products in the same class. Presence or history of any medical condition that may place the participant at increased risk following exposure to OnabotulinumtoxinA X or interfere with the study evaluation, including: Diagnosed myasthenia gravis, Lambert-Eaton syndrome, amyotrophic lateral sclerosis, or any other significant disease that might interfere with neuromuscular function. Facial nerve palsy. Infection or dermatological condition at the site of study drug injection.