Why don't I have the new home layout on my iphone when it supports ios 12?

I have iphone 5s and it supports ios 12 and i always get notifications about what is new and to install it, but i noticed that ios 12 has new home design and my design is still the same (the old design) even though i've updated it. Why is this? How to have the newest design?

Do you mean the layout of icons on the home screen?

The only time they are re-arranged without you doing it is if you do a factory reset or DFU reset, totally erasing all your personal info from the phone so it comes up asking for activation and its owners info.

Changes to the screen layouts are part of the personalisation that the owner does to a phone, so not changed during updates.

You can drag just the app icons as you want to mimic the new default layout.

Don't know what home layout you are referring to. The iOS home screen grid has been the same since day 1, iOS 12 didn't change that.

Perhaps the new home design is only supported on the newer iPhone's.