Hope this might be helpful:
You're right, the "Enable table-less layouts" feature switch doesn't affect Event Registration Forms in Dynamics 365 Customer Insights - Journeys; it's primarily for standard Marketing Forms. This is a known architectural limitation rather than a bug.
Working solutions typically involve aggressive CSS overrides on your external website to counter inherited styles from the parent site. Alternatively, for complete control and flexibility, building a custom event registration portal using the Event Management API is an option, though it requires significant development.
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