Learn how to delete all custom object records of a custom object.
1Navigate to Object manager entry in the left navigation menu.
2Click the custom object name in the Label column. The custom object detail page opens.
3Click View Object Records in the upper right of the window.
4Click the Delete All icon (delete all icon) at the upper right of the record list view.
5Click Delete in the confirmation dialog. Note that the records are deleted immediately and, therefore, will not be retained once you confirm the deletion.