Hello phoenix140,
Welcome to Apple Support Communities!
It sounds like you'd like to put a screen protector on your iPhone, and you'd like to know if the front lens may be blocked. We'll be glad to help.
You'll need to select a screen protector that fits your iPhone 11 without covering the front camera. You can find screen protectors here: iPhone 11 - Clear Film - iPhone Cases & Protection - iPhone Accessories - Apple
If you purchase a screen protector that doesn't fit the iPhone screen correctly, the camera, receiver, and microphones may not work properly.
Take care.