Try this. Right click the file explorer icon. This will produce another window. Right click "File Explorer", which you will now see there, and select "properties"
delete everything you see in the line "target"
Insert, instead C:\ Apply
Now see if the bar is as you want it.
Just had another read of your post. This bit "I didn't have this line before " jumped out.
Now I am thinking that the line has always been there, but your nephew has moved it?
Try clicking the arrow, as in my picture, and move the line to the top. That maybe what you had before?
The OP is showing the Windows 8 File Manager. I believe the lock option is only in the browser? (or the windows 7 file manager)
But, his problem and comment intrigued me. You may have the solution. I have always had that line in Windows 8 File manager. But, in Windows 7, the layout was totally different and, of course, the line was not there. I wonder if the user has not been using the Windows 7 file manager, through a third part fix, and the nephew has reverted to the Windows 8 version??
( I think the "Classic" start menu has that option?)