For added security when showing your phone to someone else, use the screen pinning option to lock the display on the current app.
Home screen, tap
Screen pinning, and then tap the
On/Off switch to turn it on.
On the Apps screen, open the app that you want.
Press , and then tap on the app thumbnail.
If you're using the card view, press and hold the thumbnail of the latest app you opened, and then drag it up a little bit to see the icon.
When prompted, tap
If you're using a lock screen, select the
Ask for unlock pattern before unpinning option for added security.
To unpin the screen, press and hold and at the same.