The default is enabled. You can choose to disable Deduping while Multifile is enabled. To set the preferences, list the database shortnames in the order in which they should be preferred by the Ovid software. The mapping feature does not work in Multifile databases. However, each database's mp fields can be searched concurrently, and other tools such as Tree and Thesaurus are available.
Mapping is available for single-database searching.
The Browse Options feature for full text databases is disabled in Multifile databases.