I have te same issue.
In fact, it is called "Taskbar and Start Menu Properties" - but a "Start Menu" tab is missing, hence I cannot adjust my Start Menu settings!
This is the Hungarian version, but when I called Microsoft Support, the agent said she cannot see it either! There should be 4 tabs ("Tálca" stands for "Taskbar" while "Eszköztárak" for "Toolbars").
Very weird, as the Start Menu (I assume in a highly customisable way) was one of Microsoft's "selling points" for the new op. system, claiming they heard the complaints of users re. the Windows 8/8.1 adventure.
This is what I saw in other "how-to"s. This is how it is supposed to look like:
And this customisation IS apparently missing from the final version of Windows 10!!!
Very strangely the Microsoft agent told me to post this issue on Microsoft forums (which I did now), as they can only support with download / installation issues, but cannot log such issues?
Very weird, indeed.