currently you can not delete it by yourselves but you can open a support ticket providing the AWS account id and region in which your serverless is , support can delete it for you.
If you do not have support you can just send an email to the email address you can find in the Amazon Redshift Serverless documentation page. Ask to delete the endpoint and share the AWS AccountID and region in which the endpoint was created.
We plan to provide the delete capability during GA.
hope this helps
I have sent email to mentioned email address and waiting for serverless redshift to be deleted. I have hard time to understand how preview started without a delete button.
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