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Back (Left dot button): Opens the previous
screen you were working in, even if it was in a
different app. Once you reach the Home screen,
you can’t go back any further in your history.
Home (Middle circle button): Opens the Home
screen. If you're viewing a left or right Home
screen, opens the central Home screen.
Recent apps (Right dot button): Opens a list
of thumbnail images of the apps you've worked
with recently. To open an app, touch it. To
remove a thumbnail from the list, swipe it left or
right.
Note: After a short time without being used,
these buttons may shrink to dots or fade away,
depending on the current app. To bring them
back, touch them.