How do I fix lines on MacBook Pro

Hi,

Try to contact Apple support or make Genius Bar reservation or take your MacBook Pro to Apple authorized service provider to show them your screen.

I think it's a LCD or LCD backlight issue. You need to repair it.

jordanwolff wrote:

How do I fix lines on MacBook Pro ?

You do not say what exact Mac /model /year /size /retina /touchbar is this

or

what exact macOS you are currently running?

See if you qualify: Service Program—

https://www.apple.com/support/13-inch-macbook-pro-display-backlight-service/

All you can do is take it in and have it repaired.