Deleting a field at the top level position—not as a part of field group—will move it to trash without asking for confirmation. You can always restore it from trash. Deleted field is found at the top of the list in the trash.
There is no auto-delete timer for fields in trash—they are kept there forever until you choose to delete them manually.
If you deleted a field, but not permanently, the field key of this field is still preserved. System won’t allow you to choose the same field key for any other field whether the field is trashed or not.
When deleting complex fields such as tabs, accordions, and repeater, the field keys of the parent field as well as all its subfields are all preserved.
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