I was just trying to fix this one, and I am not finding where this command is listed as being in the contextual menu. The list for those commands, unique to that menu, are in §8.1.3, under the subheading, PDF Contextual Menu, on pg. 129 of revision 3.1.5.1-02.
However your screenshot shows the main View menu appendix, or View ▸ PDF Display more specifically, which does have that command within it. (Never mind that I cannot do anything to make it work, but that appears to be a bug rather than a documentation issue.)