What is the Super key?
When you press the Super key, the Activities overview is displayed. This key can usually be found on the bottom-left of your keyboard, next to the Alt key, and usually has a Windows logo on it. It is sometimes called the Windows key or system key.
If you have an Apple keyboard, you will have a ⌘ (Command) key instead of the Windows key, while Chromebooks have a magnifying glass instead.
To change which key is used to display the Activities overview:
Go to the desktop and start typing Settings.
Click on Settings.
Click Keyboard in the sidebar to open the panel.
In the Keyboard Shortcuts section, select Customize Shortcuts.
Select the System category.
Click the row with Show the activities overview.
Hold down the desired key combination.