Explorer & Shell > Explorer > Items View > ListView > GroupHeaderLine
Or
Windows 10 Dark Mode > Explorer & Shell > Explorer > Items View > ListView > GroupHeaderLine
I have edit the first one, so
Explorer & Shell > Explorer > Items View > ListView > GroupHeaderLine
But i don't have edit the horizontal line in my classic shell start menu when i write something in the search bar.
For the second one, i already i have change the img so it don't this one..
Another idea(s)?