How to get horizontal lines off my iPhone 11 screen?

I concur with H1290’s advice. Take a screenshot by pressing both the Power and Volume Up button at the same time. Then view the screenshot but rotate the orientation so they don’t overlap and thus we can tell whether the lines are in the screenshot or not. If it is, this would indicate a software issue and is best remedied with a Forced Restart procedure. If the lines are not present in the screenshot, this would indicate a hardware issue, most likely with the screen digitizer. That would be best remedied with a visit to the Apple Store’s Genius Bar or an Apple Authorized Service Provider near you.

Apple Support Resources:

• Perform a Forced Restart procedure: Force restart iPhone - Apple Support
• Make an Apple Store Genius Bar reservation: Genius Bar Reservation and Apple Support Options - Apple
• Make a reservation at an Apple Authorized Service Provider: Find Locations

FURIOUSWITHMYSERVICE wrote:

no

Then this would indicate a hardware issue with your iPhone that needs to be checked out.

Hello!

Do these lines show up on a screenshot?

I have lines going down the middle of my screen.

Can I get rid of them or can they be fixed?

no