How can I delete custom fields?

You can delete a custom field from the Settings > Display & Formatting > Custom Fields screen by clicking Delete from the row-action menu of that custom field. You can also delete custom fields in a batch by selecting them on the grid and clicking Actions > Delete. Note that deleting a custom field will remove it from all screens where it was applied, so make sure you no longer need the field before deletion. Check CORE Help Center for more details.