These settings will now apply to all of your EndNote libraries.
The layout of the panels in the library window can be changed by using the Layout button on the bottom right hand corner:
Column headings in EndNote library window can be dragged to new positions.
To find references when you have a large library:
Select a reference(s), select References > Find Reference Updates. EndNote highlights the differences in side-by-side dialog boxes. You can choose to update the empty fields only, replace all the fields or copy and paste specific information.
To find duplicates select References > Find Duplicates. Compare the records in the the side-by-side screens and choose the one you want to keep by selecting the Keep this record button.
To set-up auto-deleting of duplicates retrieved from online searches, open Edit > select Preferences > Duplicates > tick the Automatically Discard Duplicates box > select OK.
Warning: make sure you don't delete a cited reference when deleting duplicates. Always Cross-reference the Record Number in a reference (add it as a field) to the references listed in your active Word document (shown in the Endnote library display pane).