Once you are connected to an online database and that database is selected for searching, certain elements on the Search panel change from the settings that are available for EndNote library searches.
The search set list changes when searching an online source. You can search either the remote database or the list of references already retrieved and saved from the remote source.
The Match Case and Match Words options are not available for online database searches.
The options available in the search menus (such as Author, Title, or Keywords) vary with each database, and they are not the same as searching the fields in an EndNote library (see Searching EndNote Fields vs. Online Database Indexes).
The following fields are not available in the search menu for searching an online source: PDF, Any Field + PDF with Notes, and PDF Notes.
The comparison list for each search line is always set to Contains.