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There is no built-in option in Windows to completely hide the Taskbar (other than setting it to Auto-hide). Using NirCmd or a similar 3rd party tool, you can hide the Taskbar using it's Windows Class name.
Command-line to hide the Taskbar
nircmd.exe win hide class Shell_TrayWnd
And to show the taskbar, use:
nircmd.exe win show class Shell_TrayWnd
References:
But I want to hide it only when I'm on the full screen start menu – Skrey – 2016-07-18T12:14:58.173
Easier option would be to create 2 shortcuts (one to hide, another one to show), and assign a hotkey. For example,
Ctrl + Alt + S
can be assigned to show taskbar, andCtrl + Alt + H
can be assigned to hide it.There is no automatic way to do that. – w32sh – 2016-07-18T12:16:26.677