Native Instruments designed the "Libraries" tab exclusively for commercially encoded libraries (those with an .nicnt file registered in Native Access). If you have third-party libraries (e.g., from The Unfinished, Keepforest, or Wavelet Audio), they don't appear there. You have to use the Files tab, which is cumbersome.
Kontakt has two types of presets: Snapshots (XML files) and NKI patches. A better manager aggregates both into a searchable database. klm30doubleykontaktlibrarymanager better
Select the "Add in Bulk" option to scan your primary "Sample Libraries" hard drive. from The Unfinished