Dual app note 10 +

I have two Kindle apps on my note 10+ each app is logged into a different user. I love cause I have an account for my personal and business accounts two questions 1. Is this a new feature (if so it doesn't show up in the new dual messenger area like fb does)2. How do I do it again with other apps ( only app that shows up in dual messenger is fb)

You can have one in the secure folder

The one that I have is not in a secure folder.