You can create a guest user at settings > users. This way you can give your phone to others without them being able to see your private messages.
Either:
- long tap on a free space on your screen and then go to widgets or
- perform an edge swipe and go to all apps.
then long tap an app or widget and move it to the right edge of your screen. A new screen will appear. You can then rearange the screens by long tapping a free space on the screen again and then long taping one of the screens and moving it around.