Need Some Clarification On Jailkit

I am having a difficult time understanding Jailkit.

When I create a Virtual Server I can see that it is being set up via:

Setting up chroot jail …

… jail directory is now /home/chroot/158362951415346

I can see that those directories have been set up. However, when I SFTP or SSH into the server I am not restricted to the home directory.

Can someone help me understand this better?
Most of the information that I have searched for seems very old.