My book live share files

[Shabuboy]

Public is what it implies, public and anyone will be able to see it.

If you want separate folder for each user, then create a private share for each user.

Read the manual, specially the section about “Managing shares”. As well as “Managing users”. Take your time, play, test, learn it. Once you do, you will pretty much mastered the admin for most NAS devices, regardless of brand.