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It’s called Reachability. It brings down the top half of the screen to help using the phone one handed.
If you’re talking about the screen shifting halfway down the display that’s to make it easier to reach stuff on the top half of the screen when using the phone one-handed.
If you’re asking about something else you’ll need to be more specific.
Gotta say it takes me more time to find the right spot to activate it than reaching the top of the screen