iPhone Screen comes down when we scroll down

Hi, could you please explain When we scroll down on the screen there is a space creating on the top of the screen and what is the use of that and how to use. See attached photo.

hi bro, this is called reachability feature. when you swipe down at the bottom of the screen top section of the screen comes down to let you access the top screen content. if you dont want the screen to come down for easy access then you can turn it off by going to settings - accessibility - touch - reachability.

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Thanks for your reply bro, do you have any video related to this ?

Not yet bro. will do one short video soon. attaching apple document for reference.

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