Hi Peter,
Thank you, I got it working by creating a field Group and apply the ID into the builder (https://prnt.sc/ZOCjigIf8_U9)
The delete icon do displayed
(https://prnt.sc/U0TsxWjpaVYG)
What if I don't have any custom field to add for the frontend submission, only need 'title & content', how can I still show the 'delete' icon? Or it is necessary to set up a field group even though there is no custom fields in the field group?