Duplicates
To repair a duplicate conflict:
Make sure that View > Show Conflicts is selected.
Select "Conflicts" in the Sources List.
Select "Duplicates" in the popup menu.
Select multiple conflict cases which you want to resolve via the check boxes.
Select inside each case which version of a font you want to keep.
Select "Replace removed duplicates in Sets with remaining font" if you want to exchange the fonts which will be removed with the remaining font in all Sets.
Select "Move files of removed duplicates to trash" if you want to move the font files of the duplicates which will be removed to the trash.
Click "Resolve duplicates".