It should already be flush. Your Joomla template is likely forcing a width on it or possibly breaking Bootstrap 4 grid usage. Switch to default Joomla protostar, clear Joomla cache if enabled, then see if issue persists. If it doesn't contact your template developer.
Kyle (Krileon)
Community Builder Team Member
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If you are a Professional, Developer, or CB Paid Subscriptions subscriber and have a support issue please always post in your respective support forums for best results!
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