Why does my screen show all windows when mouse moves

When moving the mouse my display shifts to showing all open windows.  Why is this happening all of a sudden?
Have checked Disk Warrior and restarted, but it keeps doing this!

What should be in each spot??
Whatever you use the most. As an example I'm right handed to I set the button on the right to Seconday Button so I can take advantage of the menus available for going back a page, reloading a page, etc., when right clicking.
I use the left button to switch between Applications.
It's just a matter of what works best for you 

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