Anonymous works are defined by EndNote as references where the Author field is blank (not "Anonymous"). The settings in the Anonymous Works panel applies to the in-text citations and bibliography templates.
Styles are defined in Edit > Output Styles > Open Style Manager.
Leave Author Blank: The author section of the formatted reference is left empty. If the references are to be sorted by author names, the anonymous works would be sorted at the top of the list because they have no author.
Use Full Title in Place of Author: Where the author would have appeared, the title is used instead. If the references are sorted by author, the anonymous references will be sorted as though the title were the author. If you would prefer that EndNote use the contents of the "Short Title" field in place of the full title (where available), click the "Use Short Title" radio button. If EndNote encounters a reference that does not have anything entered into the Short Title field, it uses the contents of the regular Title field instead.
Use Short Title in Place of Author: Where the author would have appeared, the short title is used instead. If the references are sorted by author, the anonymous references will be sorted as though the short title were the author. If EndNote encounters a reference that does not have anything entered into the Short Title field, it uses the contents of the regular Title field instead.
Use APA Specifications: The American Psychological Association format (used by many journals) requires a special variation of the "Use Title in Place of Author" option.
Insert Text: The text that you enter here appears in the author’s place in the formatted reference, and it is used for sorting purposes if the references are to be sorted by author names. Commonly this text would be something like the word "Anonymous" or "Anon."