It’s Impossible For Anyone to See Anything on Your Phone Because The Screen is Locked.
You may lend your phone to a close friend or family member for a variety of reasons, such as sharing images or games. A risky endeavor, even when working with people you know and trust, It’s a good idea to put a lock on any information on your phone that you don’t want anyone else to see.
The good news is that you can keep your children safe by enabling Screen Pinning, which is located in Settings > Security & Location. Select the app you want to show them, then click the pin icon at the bottom of the screen while holding down the Overview button to complete the demonstration. You can override by pressing and holding the Back button on your keyboard while simultaneously pressing the Overview key.