Delete a custom entity
You can delete custom entities, but you can't delete standard entities.
On powerapps.com, expand the Data section and click or tap Entities in the left navigation pane.
In the list of entities, click or tap the entity to delete, and then click or tap the Delete entity option from the command bar.
In the dialog box that appears, click or tap Delete to delete the entity.
When you delete an entity, you delete both the entity definition and all data that the entity contains. Entities and the data within them cannot be recovered if deleted.
You might break an app or flow if you delete an entity that is used in that app.
If entity A has lookup fields to entity B, you might have to delete entity B before you can delete entity A.