When touching this word 'Hide', one will think of the F11 key. It's not wrong, but it's not correct. F11 indeed hide all of the applications or files opened at the sight being hidden, but they're not really hidden, they're just being driven away to the side of the desktop, and they will definitely come back to view whenever clicking action performed on one of them.
Therefore, if the desire is to hide those eyes distractions, it's recommended to use real hide instead of that fake one above. There are two ways to hide. As usual, the slow one and the fast one.
The fast way is using keyboard shortcut.
It's fast, isn't it? However, knowing slow one won't be disadvantageous. Try reading this article Icon - Smart on Dock that tells about some of the tricks that can be done around the Dock, including hiding trick.
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