If you go four levels down:

C: \ 1 \ 2 \ 3 \ 4 . . . and right-click on 4 to make a: New / Folder . . .

. . . if there are a lot of folders in the right hand pane,
and your mouse is hovering over one of them, after you click on the word "Folder,"
it doesn't do the expected action, to give "New folder" a name, instead,
whatever folder you were hovering over in the right hand pane,
it puts the focus on that, and leaves you with a folder called "New Folder."
You have to then go back, right-click on "New Folder," and rename it.
Alternatively, if you quickly move the mouse, and hover in the left hand pane after clicking on the word "Folder," it behaves as expected, and waits for you to give "New Folder" a name.

It seems to me like the default action should be to leave the focus on, first, giving "New Folder" a name, regardless of where the mouse is.

I see that it acts this way, because in:
Control Panel / Folder Options / General tab / Click items as follows /
I have it set to: Single-click to open an item (point to select), and Underline icon titles only when I point at them
If I have it set to Double-click to open an item (single-click to select), it behaves as expected - but I like Single-click

I think there should be an exception for this, when making a New Folder with Single-click