Hi @UtauyoNASE
Currently, it doesn't seem to be feasible to remove the registered webinar person. Please refer below document to modify webinar info: https://support.microsoft.com/en-us/office/change-webinar-details-4c96d5a9-d423-4a9f-a169-189bad1e4125
To achieve your requirements, we recommend you give your feedback in Teams Feedback Portal. Microsoft will always focus on customer’s feedback and experience. Some new features would be added to the services based on customers' feedback in the future, and your good ideas will be very helpful for them to improve the service.
Your time, understanding and cooperation will be highly appreciated.
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