Is the Droidfix lab app really fixing the display issue on Samsung phones ?

[snaptech]

yes you can fix your green line problem 

[rockzzz]

Are you sure

[cs_member10]

Dear Samsung Member,

Greetings from Samsung Customer Support!

As per your query, we want to inform you that these all are third party application, we can't say anything about it, however, if you are facing line issue on your device, kindly perform the following steps to resolve your issue.

Kindly restart your device once: To power off through Quick settings, swipe down from the top of the screen. Tap the Power icon in the upper right of the screen (next to the Settings icon), and then tap Power off.

Update the software if available: https://www.samsung.com/in/support/mobile-devices/samsung-galaxy-smartphone-how-to-update-software/

Reset your device: https://www.samsung.com/in/support/mobile-devices/samsung-galaxy-mobile-how-to-perform-a-factory-res...

If the issue still occurs, please visit the service center for a physical inspection of your device. You can locate your nearest service center with this given link: https://www.samsung.com/in/support/service-center/

Warm Regards,
Samsung Customer Support