Personalized settings enable users to boost the rankings of electronic records that match their preferred disciplines. This type of ranking is particularly helpful for ambiguous searches, where search results come from a variety of disciplines or include a large set of articles. It does not replace topic facets or act as a filter. It simply adjusts the ranking algorithm to the general discipline of the user.
These preferences are retained during the session for guest users and between sessions for signed-in users. An overview of the Personalize option is available on the Ex Libris Knowledge center, linked here.