Android FAQ: How do I “pin” a screen in Android?
Pinning a screen in Android requires a setting change. Once you’ve made that change, you can “pin” a screen so it is always shown when you log into your Android device. Here’s how to do it.
Android screen pinning setting
To pin a screen in Android, you first have to go into your settings and make a change. So go to the Settings app, then tap Security. When you scroll down you’ll see a “Screen pinning” setting, as shown here: