I have shown the steps on Windows 11; however, you can ensure that all the steps will also work on Windows 10 and Windows 8.
Although the white line exists in both light mode and dark mode in Windows 11, it usually disturbs the dark mode users because of the contrast. However, because we'll be able to remove it in 8 simple steps, you don't need to worry about it anymore.
Open File Explorer.
Altkey on your keyboard. This makes visible the File Explorer menu.
Right-click on the File Explorer menu again to ensure that the
Lock the toolbarsoption has been checked.
Altagain to hide the menu.
F11again to exit from full-screen mode.
If you have followed the instructions above carefully, you probably have been able to get rid of the white line successfully. Still, if you have a problem, you can ask for help by using the discussion form below.
Before finishing, I'll thank @albertocordoba for his question that makes me aware of this issue.
Also, I want you to know that I'm sorry for answering your question late. I was trying to get rid of my health problems for a long time. That's why I couldn't deal with the questions. Fortunately everything is fine now and I'm here for all your questions. 😊✌️
If you have any problems with Windows (11, 10 or 8) like him, you can ask for help by creating a post for your questions by using the
Create a Post button on this page. I'll answer your questions as soon as possible.