Windows 10: White line in File Explorer Dark Mode

Hi,

On my File Explorer, there's this strange white line as seen in the picture. Anybody got any suggestions
how to fix it?

Thanks.

:)

 

File explorer in dark theme gone!

There was an option for choosing dark mode. I followed both suggestion above to the letter. But it did not fix the problem. Only Explorer is white. Which was the behavior before 1809.

 

White line beneath file explorer menu and search bar.

Thanks for the suggestion, but it didn't work. I don't think its a visual glitch, because when I hover over the white line with my cursor, my cursor becomes a double-headed arrow, like as if I could drag and extend it. It's there when in light mode too.
I was thinking maybe it was something like a tool bar with nothing in it.

edit: Tried to capture it but unfortunately Printscreen and Snapping tool doesn't capture the mouse cursor.

 

dark mode for file explorer

Can anyone tell me how to enable dark mode in file explorer. I have turned my theme setting to dark but it doesn't affects the file explorer