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The Predefined tab in the Add view enables creation of elements, which the UI does not necessarily support editing or displaying of.
For example:
Creating a value field with a bind field and several filters
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How to create a predefined value field.
The Details panel displays an uneditable text field; this is used whenever an element cannot be parsed correctly by the UI. This is not an error: a search theoretically supports infinite nesting of filters/value fields and so a choice was made not to support displaying and editing elements, which have nested filters or value fields.
In other words, be wary of using predefined elements because they might be overly complex and offer a lot less transparency.