Just updated my Ubuntu to 18.04, but I couldn't find how to hide all windows with one click by the icon. In 16.04 it was something like "show Desktop" icon on the Ubuntu dock (left sidebar).
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Change this setting:
Settings -> Devices -> Keyboard -> Navigation -> Hide all normal windows
This is the setting you need.

CentaurusA
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mk1024
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1Thank you but I needed the icon in the sidebar (similar like in windows). – Zhi V Sep 06 '18 at 21:13
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Just press Super (the "Windows" key) + D to immediately hide all of the open windows, and the same again to bring them back...

Gregory Opera
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1Super+D seems to be disabled by default in Ubuntu 18.04. I had to change this in the settings (as explained in the answer by mk1024). – Håvard Tveite Oct 09 '18 at 23:04
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How strange - it was ENABLED by default for me (and no this wasn't an upgrade - I "clean" install new Ubuntu LTS versions)! – Gregory Opera Oct 16 '18 at 09:25
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