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Lightning - 'delete' button
How can I create a 'delete' custom button for Lightning, in similarity to the one existing in the Classic details view? :

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May I suggest you please refer the below link for reference.
- https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/data_service_delete_record.htm
Hope it will be helpful.Please mark it as best answer if the information is informative.
Best Regards
Rahul Kumar