Home button
Isn’t there a thing where if you lightly double tap the home button the screen goes down? What is the purpose of that?
Here’s an example:
That happens whenever true home button is lightly double tap the home button.
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It's called Reachability.
2 light taps on Home button, so you can reach the top row easily.
2 light taps again or press Home button once to return back to normal.