Before the edit is performed, the Filter "sKeywords" has an "InList" Comparison Type, which means that the filter will filter outany results, whose keywords does not match any of the supplied keywords.
After adding the Predetermined values, the filter will now always filter out results, which do not have any of the keywords "pink", "fluffy", "sith" or "lord". I.e. the Filter has become a lot less dynamic.
Before the edit is performed, the Filter "sKeywords" has an "AllInList" Comparison Type, i.e. any results, which do not have all of the supplied keywords are filtered out.
After the edit, the Filter has an "InList"Comparison Type, i.e. any results, which do not have any of the supplied keywords are filtered out.