How do I prevent someone from viewing my iPhone screen?

Hello!

Try one of those privacy screen protectors which do not allow for "side-viewing" of your screen. If the issue is something else, please provide more detail. Thank you!

What makes you think that someone is viewing your screen? Are they looking over your shoulder? Unless someone has had possession of your phone for about a half an hour, your Apple Account and password, no one is in your phone. Your iPhone provides great security with passcode and 2FA for other things.

How do you know?

Unless they are sitting next to you looking over your shoulder, no one is viewing your phone screen.

Calling the poster no one is a bit harsh.

🤣