XF 2.0 How do you insert a horizontal rule into the nav menu?

Stuart Wright

Well-known member
I'm rearranging the nav menu and have put What's New and Members under the Forums menu.
I want to insert a horizonal rule above each of them to separate them out, but can't see how to do that.
Is must be possible, but I'm not seeing an option for it.
How can I add a horizontal rule, please?
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