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System
1. Go to Settings--Security & Privacy/Security-- (More security settings)--Screen pinning/ App pining, turn it on;
2. Open the app where you want to pin(lock) the screen;
3. Click Overview button，tap the app icon at the top of the screen,then tap pin icon to pin(lock) the screen.
On some models, within the pinned app, you can further limit the access to a certain page only.
For example, when showing a photo from your album to other people, and you’re worried about content or information on other pages being viewed, you can pin the page so only this picture can be viewed.
You can enter Settings -- Security --App Pinning—Pinning range and choose “Pin this page and disallow actions”
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