All the Kontakt libraries from NIs website will feature down the left hand side of kontakt5 in a drop down menu format, if you have installed them.
Further:
A little explanation of products for full Kontakt and Kontakt "Player"
https://youtu.be/WWCjcJIy1HE?t=109
This is why
most 3rd party libraries are unlicensed (libraries not on NIs site), and thus require full Kontakt. It costs developers a lot of money for them to make a product work unrestricted in the free version of Kontakt.