How do I get the taskbar to disappear in full-screen Start menu (WINDOWS 10 ONLY)

[Windows 10]

As a person who uses windows 10 (and wants to make it a windows 8 at the same time without changing the OS to an older one), I want to make the taskbar hide while in Start menu with full-screen turned on. Also, how do I create diagonal scroll? Anyways, it would really help if this is answered. Thank you, Microsoft employee (or question answerer (or other windows 10 user (or... I can't think of anyone else))).

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